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You Can Trust
Our dermatology clinic provides comprehensive diagnosis and treatment for all skin conditions, specialising in acne, eczema, epidermal cyst and skin cancer at Gleneagles Medical Centre in Singapore.
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Founded in 1996, TSN Dermatology, formerly known as Tham Siew Nee Skin Clinic, provides medical, surgical, and cosmetic dermatology care at Gleneagles Medical Centre in Singapore. With more than 60 years of combined clinical experience, our skin specialists assess and manage a broad range of skin, hair, and nail conditions, with particular experience in areas such as eczema, skin cancer, Mohs micrographic 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.
About The Company
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 skin clinic in Singapore covers medical, surgical and cosmetic dermatology, guided by clinical judgement, ethical practice and thoughtful attention to each patient's needs. We provide a wide range of treatment options, including biologics, phototherapy, laser procedures and skin surgery, based on each patient's diagnosis and needs.

We manage a wide range of acute and chronic skin conditions through careful assessment and evidence-based care, tailoring treatment to the severity of the condition and each patient's individual needs. Our services include the diagnosis and management of acne, eczema, psoriasis, rosacea, hives, warts, skin infections, and many other dermatological conditions. Treatment plans may include phototherapy as part of a personalised approach to care.
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Our skin doctors offer cosmetic dermatology treatments to improve concerns such as wrinkles, acne scars, pigmentation, skin laxity, and unwanted moles. Treatment options include chemical peels, TCA CROSS, and other evidence-based procedures tailored to your skin condition and aesthetic goals, with a focus on skin health, safety, and realistic outcomes.
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We perform a range of in-clinic skin surgeries under local anaesthesia, including cyst surgery, skin cancer surgery, Mohs micrographic surgery, and the removal of other skin lesions. Every procedure is planned with careful attention to safety, functional preservation, cosmetic outcomes, and minimising scarring.
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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 Singapore 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 at our dermatology clinic 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.

