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Comprehensive diagnosis and treatment for all skin conditions, especially in acne, eczema, epidermal cyst and skin cancer at Gleneagles Medical Centre in Singapore.
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At TSN Dermatology, we believe every patient deserves professional and personalised care. Our experienced team treats a comprehensive range of skin, hair, and nail conditions, with special expertise in eczema, skin cancer, and advanced therapies such as Mohs surgery and phototherapy.
By combining advanced technology with customised treatment plans, we ensure effective and lasting results, helping you look and feel your best, with expert guidance and transparent pricing.
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Over 60 Years of Combined Dermatology Experience
Specialist Training in Singapore, the UK and the USA
Expertise in Medical, Surgical and Cosmetic Dermatology
Leadership Roles and Service Awards in Dermatology
Committed to Charity and Humanitarian Work



Senior Consultant Dermatologist
Bachelor of Medicine, Bachelor of Surgery (MBBS)
Member of the Royal College of Physicians (United Kingdom)
Master of Medicine (Internal Medicine)
Fellow of the Academy of Medicine, Singapore (Dermatology)
Dr Koh Hong Yi is a Ministry of Health-accredited dermatologist with over 20 years of experience in medical, surgical and aesthetic dermatology.
He trained in Singapore and the UK, and is particularly interested in Mohs micrographic surgery, dermatologic surgery, skin cancer care, and inflammatory skin diseases.
Prior to private practice, he founded the Mohs Surgery Service at Singapore General Hospital and served as consultant dermatologist and Adjunct Assistant Professor with Duke-NUS Medical School, contributing to clinical research and education.
About Dr Koh
Our practice covers medical, surgical and cosmetic dermatology, guided by clinical judgement, ethical practice and thoughtful attention to each patient's needs.

We manage acute and chronic skin conditions (e.g. acne, eczema, psoriasis) through careful assessment and evidence-based care, tailoring treatment to disease severity and individual patient needs.
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We offer cosmetic dermatology treatments to improve concerns such as wrinkles, acne scars, pigmentation and skin laxity, with a focus on skin health, safety and realistic outcomes.
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We perform in-clinic surgical management of various skin lesions under local anaesthesia where appropriate, with careful attention to safety, scarring and clinical outcomes.
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You should consider seeing a dermatologist if a skin condition is persistent, worsening, painful, or affecting your daily life. Early assessment can help clarify the diagnosis and allow timely, appropriate treatment.
Look for a dermatologist who is MOH-accredited, has relevant experience in your specific skin concern, and takes time to explain your options clearly. You should also choose a doctor who prioritises safe, evidence-based treatments and personalised care.
No referral is required. Simply drop us a message in our enquiry form, give us a call at 6476 6821 or WhatsApp us to make an appointment.
Some medically-indicated procedures may be claimable under insurance. Our team can help advise on whether a treatment is likely to be claimable.
Your first consultation involves a detailed discussion about your skin concerns, symptoms and medical history. This is followed by a careful clinical examination, after which your dermatologist will explain the diagnosis and discuss appropriate treatment options with you, taking your preferences and overall health into account.

