Senior Consultant Dermatologist & Dermatologic Surgeon

Dr. Phoon Yee Wei

  • MBBS (Singapore)
  • MRCP (UK)
  • MMed (Internal Medicine)
  • FRCP (Edinburgh)
  • FAMS (Dermatology)

"Dr. Phoon Yee Wei is a senior consultant dermatologist and dermatologic surgeon with expertise in medical and surgical dermatology. He treats both adults and children and has experience in skin surgery, cosmetic procedures, laser surgery, and the use of biologic treatments and novel small molecules for complex inflammatory and immune-mediated skin disorders."

About Dr. Phoon Yee Wei

Ascensus Health Specialist Centre - Ascensus Skin (RSMC)

  • A: 101 Irrawaddy Rd, #09-01 (Unit 3)
    Royal Square Medical Centre
    Singapore 329565
  • T: +65 6908 2465
  • F: +65 6908 2466
  • H: Mon – Fri: 9am – 5.30pm
    Sat: 8.30am – 1pm
    Closed: Sunday and public holidays

Professional Memberships

  • Dermatological Society of Singapore
  • British Society for Dermatologic Surgeons
  • European Academy of Dermatology and Venereology
  • Fellow, Academy of Medicine, Singapore
  • Fellow, Royal College of Physicians (Edinburgh)

Practice Information

  • Languages Spoken: English, Mandarin, Cantonese
  • Patient Groups: Adults, Adolescents, Children
  • Practice Philosophy: Evidence-based, patient-centered care with personalized treatment approaches

Dr. Phoon graduated with a Bachelor of Medicine and Bachelor of Surgery (MBBS) from the National University of Singapore Yong Loo Lin School of Medicine in 2009, where he was awarded the Dean’s List during two of the five years of medical school. He went on to attain postgraduate qualifications of Membership of the Royal College of Physicians (UK) in 2012 and Master of Medicine in Internal Medicine in 2013.

He subsequently completed his specialist training in Dermatology and has been practicing as a dermatologist since January 2018. During his Dermatology Residency training, he worked at both the National Skin Centre and Singapore General Hospital. Dr. Phoon is a fully accredited Mohs micrographic surgeon, having completed a one-year fellowship training in advanced dermatologic and Mohs micrographic surgery at Ninewells Hospital, Dundee, Scotland.

Before entering private practice, Dr. Phoon served as Head of the Dermatology Service at Sengkang General Hospital, where he was involved in establishing the hospital’s Mohs micrographic surgery and immune-dermatology services.

A firm believer in evidence-based and patient-centered care, Dr. Phoon takes time to explain diagnoses and treatment options clearly, aiming to ensure that management plans are tailored to each patient’s needs.

Education & Professional Training

2009
Bachelor of Medicine and Bachelor of Surgery (MBBS)
National University of Singapore, Yong Loo Lin School of Medicine
Dean’s List recipient (2 years)

2012
Membership of the Royal College of Physicians (MRCP)
United Kingdom

2013
Master of Medicine (MMed) in Internal Medicine
National University of Singapore

2018
Specialist Accreditation in Dermatology
Completed residency training at National Skin Centre and Singapore General Hospital
Fellowship of the Academy of Medicine, Singapore (FAMS) – Dermatology

Advanced Training
Fellowship in Advanced Dermatologic & Mohs Micrographic Surgery
Ninewells Hospital, Dundee, Scotland
One-year fellowship program – Fully accredited Mohs micrographic surgeon
Fellowship of the Royal College of Physicians (FRCP)
Edinburgh

Academic Appointments & Research

In addition to his clinical practice, Dr. Phoon is actively involved in teaching and research, contributing to the advancement of dermatological knowledge and the training of future medical professionals.

Academic Appointments

  • National University of Singapore
    Senior Clinical Lecturer
  • Lee Kong Chian School of Medicine
    Senior Clinical Lecturer
  • Duke-NUS Medical School
    Clinical Assistant Professor

Research & Publications

Dr. Phoon has authored publications in areas of immune-dermatology and skin cancer surgery in various peer-reviewed journals, and has presented his research at both local and international conferences. His research contributions aim to advance understanding in:

  • Mohs micrographic surgery outcomes
  • Immunobullous disorders management
  • Biologic therapies in dermatology
  • Complex inflammatory skin conditions

Ascensus Health Specialist Centre - Ascensus Skin (RSMC)

  • A: 101 Irrawaddy Rd, #09-01 (Unit 3)
    Royal Square Medical Centre
    Singapore 329565
  • T: +65 6908 2465
  • F: +65 6908 2466
  • H: Mon – Fri: 9am – 5.30pm
    Sat: 8.30am – 1pm
    Closed: Sunday and public holidays

Publications

  • Dilemmas in management of brain tumours in pregnancy.
    Lew PS, Tan WC, Tan WK, Tan HK
    Ann Acad Med Singapore. 2010 Jan;39(1):64-5
  • Does low-molecular-weight heparin improve live birth rates in pregnant women with thrombophilia disorders? A systematic review.
    Tan WK1, Lim SK, Tan LK, Bauptista D.
    Singapore Med J. 2012 Oct;53(10):659-63.
  • Social oocyte freezing: a survey among Singaporean female medical students.
    Tan SQ1, Tan WK, Lau MS, Tan HH, Nadarajah S.
    J Obstet Gynaecol Res. 2014 May;40(5):1345-52. doi: 10.1111/jog.12347. Epub
    2014 Apr 21.
  • Obstetric Outcomes and Complications After Vaginal Radical Trachelectomy: A Case Report
    Wei Keat Tan, Eng Loy Tan, Lay Kok Tan
    J Med Cases. 2016;7(1):22-25
  • A case of successfully managed pregnancy in a patient with complex cyanotic congenital heart disease
    Jiayi Liu, Andy WK Tan, Ju L Tan, Eng L Tan and Lay K Tan
    Obstetric Medicine 0(0) 1–5, November 21, 2016
  • Primary omental pregnancy
    Swee Lin Yip,1,2 Wei Keat Tan,2 Lay Kok Tan3
    BMJ Case Rep 2016. doi:10.1136/bcr-2016-217327
  • Remove the Ovarian Tumor, Cure the Encephalitis: Anti-NMDAR Encephalitis With Ovarian Teratoma in a Tertiary Hospital in Singapore
    Ka Hee Chua, Andy Wei Keat Tan, Serene Liqing Lim, Wahab Syed Shahul Hameed,
    Siew Ju See, Devendra Kanagalingam
    J Med Cases. 2017;8(2):52-57
  • Analysis of endometrial blood flow with colour doppler energy in predicting outcome in GnRH antagonist down regulated ICSI/IVF cycles: a prospective cohort study
    Rubina R, Ling Y.S, Yong TT, Keat A.Tan, Rajesh H
    International Journal of Reproduction, Contraception, Obstetrics and Gynecology, Vol 6, No 10 (2017), DOI:
  • Unusual presentation of uterine rupture following laparoscopic myomectomy: a case report and literature review
    Cassandra P. S. Cheong*, Andy W.K. Tan, Lay Kok Tan, Su Ling Yu
    International Journal of Reproduction, Contraception, Obstetrics and Gynecology Cheong CPS et al. Int J Reprod Contracept Obstet Gynecol. 2018 Sep;7(9):3868-3872 10.18203/2320-1770.ijrcog20174402
  • Simulation in Surgical Education: A review of a multi-Tiered Gynaecological Laparoscopy Workshop
    Kirsten O.J.Y, Andy T.W.K, Wei D.F.C, Jason L.S.K
    South-East Asian Journal of medical Education, Vol 15, no.1, 2021, DOI: https://doi.org/10.4038/seajme.v15i1.364
  • Comparison of postpartum incontinence outcomes after vacuum-assisted and forceps-assisted deliveries in a tertiary maternity unit
    Li Shan Sng, Wan hui yip, Stella Yan Chai Hong, Stephanie Man Chung Fook-Chong, Wei Keat Andy Tan, Devendra Kanagalingam, Jason Shau Khng Lim

Areas of Specialisation and Treatment

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Surgical Dermatology

  • Skin cancers and Mohs micrographic surgery
  • Excision of benign and malignant lesions
  • Advanced reconstructive techniques
  • Nail surgery

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Immune-Dermatology

  • Psoriasis management (including biologics)
  • Immunobullous disorders (pemphigoid, pemphigus)
  • Complex inflammatory skin conditions
  • Biologic and small molecule therapies

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Medical Dermatology

  • Eczema and atopic dermatitis
  • Urticaria (hives)
  • Acne and rosacea
  • Drug eruptions and complex rashes
  • Hair and nail disorders
  • Hyperhidrosis (excessive sweating)
  • Skin Infections
  • Vitiligo

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Aesthetic & Laser Dermatology

  • Pigmentation disorders (melasma, sun spots)
  • Acne scar treatment
  • Vascular lesions (spider veins, rosacea)
  • Skin rejuvenation procedures
  • Laser hair removal

Common Dermatological Conditions

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What Is Hyperhidrosis?

Hyperhidrosis refers to excessive sweating that can be localised or affect the whole body. Sweating is controlled by the brain through sympathetic nerves, typically occurring in response to increased temperature or emotions such as anxiety. The condition commonly runs in families, with up to 30% of individuals having another affected family member.

How Do I Know I Have Hyperhidrosis?

Localised hyperhidrosis, the most common type, affects specific body sites such as palms, soles, armpits, face, and scalp, often beginning in childhood or adolescence. Generalised hyperhidrosis is less common and may be caused by underlying conditions such as infections, hormonal conditions, or certain medications. Excessive sweating beyond normal physiological needs may indicate hyperhidrosis.

What Are The Risks And Complications?

Treatment-related risks vary depending on the method chosen and may include skin irritation, redness, or tingling sensations. Oral medications may cause side effects such as dry mouth, blurred vision, abdominal cramps, constipation, and less commonly, difficulty passing urine. Surgical treatment carries risks including compensatory sweating at other body sites, which may be more severe than the original condition in some patients.

What Are The Treatment Options Available?

Treatment options include topical antiperspirants containing aluminium chloride, iontophoresis using small electric currents, botulinum toxin injections, and oral medications. Effects typically last varying periods, with most treatments requiring ongoing use to maintain dryness. Surgical sympathectomy may be considered for severe cases, particularly of the hands and face, though it carries additional risks and requires careful consideration.

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What Are Hives?

Hives, medically known as urticaria, are red, itchy, raised bumps or wheals that can appear on any part of the skin. They can range from small pea-sized bumps resembling mosquito bites to larger areas covering broad sections of the body. In most cases, hives are not due to an allergy.

How Do I Know I Have Hives?

Hives typically present as red, itchy, raised bumps that may appear anywhere on the skin, sometimes accompanied by swelling. Acute hives usually resolve spontaneously within six weeks, whilst chronic hives recur or persist beyond six weeks, often almost daily for months to years. Angioedema, a deeper swelling beneath the skin surface, may occur alongside hives, causing swelling around the eyes, mouth, face, hands, feet, throat, or genitals.

What Are The Risks And Complications?

Whilst hives and angioedema can be uncomfortable and cosmetically concerning, they are typically not harmful. Rarely, angioedema without hives may be associated with breathing difficulty or severe stomach cramps, requiring immediate medical attention. Many patients with chronic hives may experience clearance between one to five years, though individual experiences vary.

What Are The Treatment Options Available?

Non-sedating antihistamines are commonly prescribed to help manage hives and reduce itching. Higher doses or combination medications may be needed for chronic cases, with treatment duration varying based on individual response. Identifying and avoiding triggers, where possible, may help improve symptom control alongside medication.

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What Are Viral Warts?

Viral warts are a common skin infection caused by the human papillomavirus (HPV), with more than 100 subtypes. They occur most commonly in children and young adults, though they can appear at any age. Warts may be transmitted through skin-to-skin contact or environmental surfaces such as swimming pool decks and changing room floors.

How Do I Know I Have Viral Warts?

Common warts typically appear on the hands and around the nails as flesh-coloured nodules with a rough surface. Flat warts occur on the face, neck, arms, and legs as smooth, flat-topped papules. Plantar warts develop on the soles of the feet and toes, potentially causing pain when walking, whilst ano-genital warts occur around the genitals.

What Are The Risks And Complications?

Whilst warts are generally harmless, they can occasionally be painful, particularly plantar warts on the feet. Treatment methods such as cryotherapy may cause discomfort and blister formation at the treatment site. Even when warts appear resolved, there is approximately a 20% risk of recurrence at the same or other sites.

What Are The Treatment Options Available?

Treatment options include watchful waiting, as warts in children may resolve spontaneously within two years, topical treatments such as retinoids or duofilm, and cryotherapy using liquid nitrogen. Electrosurgery and lasers are rarely used in children due to potential discomfort. Treatment effectiveness varies amongst individuals, and multiple sessions may be needed for optimal results.

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What Is Acne?

Acne is the most common skin condition amongst adolescents, affecting up to 88% of adolescents in Singapore. Whilst it occurs most commonly in teenagers, acne can persist or develop for the first time in adulthood. The condition may lead to permanent scarring and can affect self-esteem and psychosocial wellbeing.

How Do I Know I Have Acne?

Early signs of acne include whiteheads (closed comedones) and blackheads (open comedones), typically appearing on the face, chest, or upper back. Inflammatory acne presents as reddish bumps (papules) and pus bumps (pustules), whilst more severe cases develop cysts and nodules. Healed acne may leave atrophic (punched-out) or hypertrophic scars, and pigmentation (dark spots) can occur, particularly in darker skin types.

What Are The Risks And Complications?

Acne may lead to permanent scarring, including atrophic or hypertrophic scars, and post-inflammatory pigmentation. Topical treatments may cause skin irritation in some patients, requiring temporary discontinuation and alternate-day application. Oral isotretinoin, used for severe cases, can cause side effects including dry skin, dry eyes, dry mouth, and less commonly nose bleeds, hair loss, headache, and muscle pain.

What Are The Treatment Options Available?

Treatment options include topical therapies such as benzoyl peroxide, adapalene, and tretinoin for mild cases, often combined with oral antibiotics for moderate to severe acne. Oral contraceptives may be considered for female patients, whilst oral isotretinoin is used for severe cases or those unresponsive to other treatments. General measures including proper facial cleansing, adequate sleep, stress management, and avoiding picking at lesions may help support treatment outcomes.

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What Is Psoriasis?

Psoriasis is a chronic inflammatory skin condition causing rapid skin cell buildup, leading to thick, red, scaly, and itchy patches (plaques). It commonly appears on the knees, elbows, scalp, and back, and is non-contagious. The condition is linked to genetic factors and external triggers such as stress, infections, and skin injuries that lead to immune system dysregulation.

How Do I Know I Have Psoriasis?

Affected skin typically shows red, raised patches covered with silvery-white scales, and may become dry, cracked, or bleed, often accompanied by burning or itching. Nails may show pitting, discoloration, or crumbling. Some patients may experience joint pain, stiffness, and swelling, indicating possible psoriatic arthritis.

What Are The Risks And Complications?

Untreated psoriasis with thick plaques on hands and feet may result in considerable functional limitation, and plaques can spread extensively. Approximately 20% of psoriasis patients may develop arthritis. Psoriasis patients have a higher risk of developing metabolic syndrome including obesity, high blood pressure, high cholesterol, and elevated sugar levels, particularly in adults above 40 years of age.

What Are The Treatment Options Available?

Mild psoriasis of limited extent can be treated with topical therapies such as corticosteroids, calcineurin inhibitors, vitamin D analogues, coal tar, and salicylic acid preparations. Moderate to severe cases may require narrowband UVB phototherapy, oral acitretin, or conventional immunosuppressive agents such as ciclosporin and methotrexate. Biologic therapies targeting immune pathways (TNF alpha, IL-17, and IL-23) are available for moderate to severe psoriasis, with treatment approaches determined by your doctor based on disease severity and individual factors.

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What Is Atopic Eczema?

Atopic eczema, also known as atopic dermatitis, is a chronic skin condition causing dry, intensely itchy, red, and inflamed skin. The majority of cases begin during early childhood and are commonly associated with other allergic conditions such as asthma and allergic rhinitis. While there is currently no cure, the condition can typically be managed with appropriate treatment strategies.

How Do I Know I Have Atopic Eczema?

The primary symptom is persistent, intense itching that can disrupt sleep. Affected skin appears dry, scaly, red or discolored, often developing into patches that may blister or weep fluid. The condition frequently affects hands, feet, neck, inside of elbows, behind knees, and in infants, the face and scalp.

What Are The Risks And Complications?

Untreated eczema may result in functional limitation and widespread skin involvement. Skin lesions may become infected with bacteria or viruses, potentially causing fever. Chronic itching can disturb sleep and negatively impact performance at school or work, as well as affect self-esteem.

What Are The Treatment Options Available?

Treatment includes regular moisturizing, gentle cleansers, and lukewarm baths. Mild cases are commonly treated with topical therapies such as corticosteroids and calcineurin inhibitors. Moderate to severe cases may require phototherapy, oral immunosuppressive agents, biologic therapies such as dupilumab, or oral JAK inhibitors, with treatment approaches determined by your doctor based on individual factors.

Treatments & Procedures

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What Is MMS?

MMS is a specialised surgical technique designed to remove skin cancers. Developed in the 1930s, this method involves the immediate and complete microscopic examination of removed cancer tissue to help ensure thorough clearance. MMS is associated with high cure rates amongst skin cancer treatments.

What Is It Used For?

MMS may be particularly suitable for skin cancers that have recurred following previous treatments or are at higher risk of recurrence. The technique may also be considered for tumours that are deceptively large or located at cosmetically sensitive sites. It aims to remove cancerous tissue whilst preserving maximum surrounding normal skin.

What Are The Risks And Complications?

Whilst serious complications are rare, potential risks may include bleeding, which is usually minimal and manageable with sustained pressure. Temporary bruising and swelling may occur, particularly around the eyes. Infection is uncommon but may present with increased redness, discomfort, or discharge during the first two weeks. Smoking and alcohol may impair wound healing; avoidance is recommended.

What Are The Advantages Of MMS?

The technique allows complete microscopic evaluation of the entire surgical margin during the procedure. It removes cancerous tissue selectively, leaving the smallest possible surgical defect whilst tissue is examined as the patient waits. MMS aims to balance complete cancer removal with optimal aesthetic outcomes, particularly for recurrent cancers or those in cosmetically sensitive areas. Individual results and experiences may vary.

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What Is Skin Biopsy?

A skin biopsy is a procedure involving the removal of skin tissue for diagnostic examination. Local anaesthesia is administered to numb the area before the tissue sample is extracted. The wound is typically covered with a dressing after the procedure.

What Is It Used For?

Skin biopsies are performed to investigate various skin conditions. The tissue is examined microscopically to help identify underlying causes and guide treatment decisions.

What Are The Risks And Complications?

Minor bleeding and itching may occur during healing. Scarring is common, with punch biopsies typically leaving a small linear scar and shave biopsies potentially causing slight indentation or temporary pigmentation. Keloid formation and infection are uncommon. Individual experiences vary.

What Are The Advantages Of Skin Biopsy?

Skin biopsies provide valuable diagnostic information to help determine the nature of skin conditions. The procedures are typically performed under local anaesthesia with minimal discomfort. Wound infection is uncommon when proper aftercare is followed. Individual healing experiences vary depending on the biopsy type and location.

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What Is Electrodesiccation?

Electrodesiccation involves the destruction of abnormal tissue using high-frequency electric current delivered via a needle-shaped electrode. Local anaesthesia or numbing cream is applied before the procedure. Curettage may also be performed to remove bulk tissue, followed by application of antiseptic ointment or gel.

What Is It Used For?

This procedure is used to treat various skin growths including seborrhoeic keratosis, viral warts, skin tags, and certain conditions such as Bowen’s disease. The treatment aims to remove these lesions effectively.

What Are The Risks And Complications?

Minor bleeding and itching may occur during healing. The treated area may develop temporary pigmentation that typically fades over time, slight indentation, or rarely keloid formation. Wound infection is uncommon with proper care.

What Are The Advantages Of Electrodesiccation?

Electrodesiccation can effectively treat multiple benign and certain cancerous skin growths in a single session. The procedure is typically performed under local anaesthesia with minimal discomfort. Recovery is generally straightforward, and wound infection is uncommon with proper aftercare.

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What Is Liquid Nitrogen Treatment?

Liquid nitrogen treatment is a procedure designed to treat and remove superficial skin growths such as warts through controlled freezing. The cold fluid, with temperatures ranging from -20°C to -196°C, is applied using a spray gun or cotton bud. Treatment typically takes less than a minute per session.

What Is It Used For?

This treatment is used to remove various superficial skin growths, including warts and other benign lesions. The freezing process aims to destroy the abnormal tissue effectively.

What Are The Risks And Complications?

Temporary pain and stinging may occur during and after treatment. Swelling and blistering, possibly blood-filled, may develop within days. The treated area may show temporary or occasionally permanent colour changes. Superficial nerve damage causing temporary numbness may occur. Scarring is uncommon, though keloid formation is possible. Nail shape changes may occur if treatment involves the nail fold.

What Are The Advantages Of Liquid Nitrogen Treatment?

Liquid nitrogen treatment is a quick procedure, typically completed in less than a minute. The wound usually heals without scarring in most cases. The treatment can be performed in an outpatient setting with minimal preparation required. Individual treatment outcomes vary, and several sessions may be needed for optimal results.

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