Clinical Associate Professor Mark Koh Jean Aan is Head and Senior Consultant of the Dermatology Service at KK Women’s and Children’s Hospital. A dermatologist, paediatric dermatologist and dermatopathologist, his interests include atopic dermatitis, genodermatoses, vascular anomalies, histiocytic disorders and cutaneous lymphoma. He holds academic appointments at Duke-NUS, NUS and NTU’s Lee Kong Chian School of Medicine.
Clinical focus
Paediatric dermatology (atopic dermatitis, genodermatoses, vascular anomalies).
Qualifications (as publicly listed)
MBBS (Singapore), MRCPCH (UK), Diploma in Practical Dermatology (UK), Diploma in Dermatopathology (ICDP-UEMS).
Where they practise
- Clinic / practice: Department of Dermatology, KK Women's and Children's Hospital (see our clinic listing) — Novena (KK Women's and Children's Hospital)
- Hospital / training affiliation(s): KK Women's and Children's Hospital (Head & Senior Consultant)
Related skin-health guides
Getting to the clinic
Clin Assoc Prof Mark Koh Jean Aan is Head and Senior Consultant of the Dermatology Service at KK Women’s and Children’s Hospital (KKH) in the Novena area, where he sees patients within the hospital’s specialist clinics.
- By MRT: Novena MRT (NS20) on the North–South Line is the nearest station, followed by a short bus or taxi ride to the hospital, as KKH sits a little way from the station.
- By bus: Several public bus routes serve the hospital and the surrounding Novena and Kampong Java area.
- By car or taxi: taxi and ride-hailing drop-off is signposted at the hospital entrances, and as a public hospital KKH provides visitor carparks on site.
What paediatric dermatology covers
A/Prof Koh’s stated focus is paediatric dermatology, including atopic dermatitis, genodermatoses and vascular anomalies. This subspecialty cares for skin conditions in babies, children and adolescents. Common areas include:
- Atopic dermatitis (childhood eczema) and other common inflammatory skin conditions.
- Genodermatoses — inherited skin conditions present from early life.
- Vascular anomalies such as birthmarks and vascular malformations.
- Other complex paediatric skin problems, including histiocytic disorders and cutaneous lymphoma.
Caring for children’s skin calls for an age-appropriate, family-centred approach, and parents are closely involved throughout.
Paediatric dermatology spans the everyday and the rare. At one end are very common conditions such as eczema, which affects many children and is best managed with consistent skincare and prompt treatment of flares. At the other are uncommon and complex problems — inherited skin conditions, vascular birthmarks and disorders that may involve other parts of the body — which benefit from specialist assessment and, where needed, coordinated care with other paediatric services. Throughout, treatments and doses are chosen specifically for a child’s age and stage of growth, and parents are supported to carry out skincare confidently at home.
What to expect at a consultation
A first visit usually begins with a detailed history — when the condition appeared, how it has changed, family history, and how it affects the child’s comfort, sleep and daily life. The dermatologist examines the skin carefully, sometimes with a dermatoscope, and may look at the nails, hair and mucous membranes.
Investigations such as swabs, blood tests, imaging or a skin biopsy may be arranged for complex conditions. The discussion then covers the diagnosis, treatment options and practical skincare advice for the family.
Much of a paediatric dermatology visit is practical and reassuring: explaining what the condition is, showing parents how to apply treatments correctly, and setting out what to expect as the child grows. For common conditions such as eczema, consistent everyday skincare is often the foundation of good control, with prescribed treatments used promptly for flares. For rarer or inherited conditions, the consultation may also cover longer-term monitoring and, where needed, how care is coordinated with other specialists. Bringing a clear picture of how the condition affects the child’s comfort, sleep and daily life helps shape the plan.
Preparing for your appointment
- Photo identification for the child and accompanying parent, and any GP, polyclinic or specialist referral letter.
- Previous records, test results or biopsy reports relating to the child’s skin.
- A list of current medications, supplements and skincare products used on the child.
- A note of when the condition started, how it has progressed, and what triggers flares.
- Photographs of flare-ups, which help when the skin varies between visits.
After your consultation and follow-up
For ongoing childhood skin conditions, follow-up reviews progress and adjusts treatment as the child grows. Reports and results are shared through the hospital’s systems and at review visits, and complex conditions may involve other specialists working together.
Continuity of care is valuable for long-term and inherited conditions, and seeking a second opinion is reasonable. Seek earlier review if the skin becomes infected — increasingly red, weeping or painful — or if the child becomes unwell or the rash spreads rapidly.
Booking, referrals and fees
As A/Prof Koh practises within a public hospital, a referral from a GP or polyclinic is the usual route and may help with subsidies for eligible patients. MediSave, MediShield Life and Integrated Shield Plans may apply to eligible procedures and inpatient care within set limits, while outpatient consultations are often paid out of pocket. Confirm current fees and your coverage with the hospital before your visit.
Common questions
What is a genodermatosis?
It is an inherited skin condition present from early life. Management focuses on caring for the skin, treating complications and supporting the family, with the plan tailored to the diagnosis.
Are birthmarks always a concern?
Many birthmarks are harmless, but some vascular anomalies benefit from assessment and treatment; a dermatologist can advise on which need monitoring or intervention.
How is childhood eczema managed?
Management usually involves regular moisturising, treating flares with prescribed creams, and identifying triggers, adjusted as the child grows.
Will my child see the same specialist each time?
Public hospital care aims for continuity, though the team may involve several specialists for complex conditions; this can be discussed at your visit.
Sources & verification
See also: Best dermatologists in Singapore (editorial directory) and our shortlist of dermatology clinics.
This is an independent, factual profile compiled from the public sources listed above — not a paid listing, advertisement or endorsement. Details can change; always verify a doctor’s current registration on the Singapore Medical Council public register and confirm specifics directly with the clinic. This page is general information, not medical advice or a recommendation of any individual practitioner. See our editorial policy.
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