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Clin Assoc Prof Mark Koh Jean Aan

Clin Assoc Prof Koh Jean Aan Mark

MBBS (Spore), DIP (Family Practice Dermatology) (Spore), MRCPCH (Paed) (RCPCH, UK), Dip Pract Derm (UK), DipDermatopathology (ICDP - UEMS, Austria)

Head & Senior Consultant

KK Women's and Children's Hospital

Specialty: Dermatology

Clinical Interest: Atopic Dermatitis, Genodermatoses, Vascular Anomalies, Cutaneous Lymphoma, Histiocytoses, Skin Cancer Syndromes

Conditions Treated by this Doctor:
Atopic Dermatitis and Other Eczemas, Common Childhood and Adolescent Skin Rashes, Genetic Skin Diseases, Lumps and Bumps in Children and Adolescents, Vascular Birthmarks.

Clinical Appointments

  • Head & Senior Consultant Dermatology Service KK Women's and Children's HospitalKK Women's and Children's Hospital
  • Deputy Campus Director, Medical Innovation and Care Transformation
  • Service Chief SingHealth Duke-NUS Vascular Centre
  • Visiting Consultant Dermatology Singapore General HospitalSingapore General Hospital
  • Visiting Consultant Department of Dermatology Sengkang General HospitalSengkang General Hospital
  • Visiting Consultant National Cancer Centre SingaporeNational Cancer Centre Singapore


Clin Assoc Prof Mark Koh is a dermatologist, paediatric dermatologist and dermatopathologist. He is head and senior consultant of Dermatology Service, KK Women’s & Children’s Hospital (KKH), as well as visiting consultant at Singapore General Hospital, Sengkang General Hospital and National Cancer Centre.

After completing his specialty training in dermatology in Singapore, A/Prof Koh embarked on a 1-year fellowship in paediatric dermatology and dermatopathology at the Children’s Memorial Hospital and Northwestern Memorial Hospital, Chicago from 2010-2011. In 2016, he embarked on a 2-month fellowship in complex vascular anomalies at Boston Children’s Hospital.

During his tenure at KKH, Dr Koh helped to set up several multi-disciplinary clinics (Vascular Anomalies Clinic, Genodermatoses clinic, Chronic Eczema Clinic). He also helped to set up the Cutaneous Lymphoma Clinic and Adult Genodermatoses Clinic at SGH, and Skin Cancer Syndrome Clinic at NCC.

His sub-specialty interests in dermatology include atopic dermatitis, genodermatoses, vascular anomalies, histiocytic disorders, cutaneous lymphomas, and skin cancer syndromes. A/Prof. Koh is also involved in teaching of medical students, residents and fellows, and in involved in several research projects and has published widely in many peer-reviewed journals and dermatology textbooks.


  • Dip Healthcare Management and Leadership (SMU) – 2019
  • ICDP-UEMS (Dermatopathology) – 2012
  • Dip Pract Derm (Cardiff) – 2006
  • Dip Derm (Family Practice) (Spore) – 2005
  • FAMS (Dermatology) – 2010
  • MRCPCH (UK) – 2006
  • MBBS (Spore) – 1998

Professional Appointments and Committee Memberships

  • Clinical Associate Professor, Duke-NUS Graduate Medical School Singapore, Academic Clinical Program for Paediatrics (PAEDS-ACP)
  • Senior Clinical Lecturer, Department of Paediatrics, Yong Loo Lin School of Medicine, National University of Singapore
  • Adjunct Associate Professor, Lee Kong Chian School of Medicine, Nanyang Technological University
  • KKH Collaborative Prescribing Agreement Committee – Chairperson, Jun 2018 – current
  • KKH Medical Board - Jan 2020 - current
  • KKH Telehealth Steering Committee – Chairperson, Aug 2020 – current
  • KKH Digital Integration Medical Innovation Care Transformation Committee (DIMICT) - Deputy clinical lead, Sep 2020 – current
  • SingHealth Artificial Intelligence (AI) Program - Honorary committee member, Sep 2021 – current
  • SingHealth Telemedicine Task Force - Workstream 2 Lead, Sep 2021 - current
  • SingHealth Innovation Council – Apr 2021 - current


  • NHG Outstanding Education Partners Award 2014
  • KK People Developer Award 2015 – Outstanding Clinical Teacher
  • RiSE (Residency in Singhealth Excels) Awards 2016 – Outstanding Faculty Award
  • RiSE (Residency in Singhealth Excels) Awards 2018 – Outstanding Faculty Award
  • Service from the Heart Award, Jan – Jun 2014
  • Gold award - Singapore Health Quality Service Awards 2016

Research Interests

  • Atopic dermatitis
  • Genodermatoses
  • Vascular anomalies
  • Cutaneous lymphoma
  • Histiocytoses
  • Skin cancer syndromes


  • MJA Koh, YK Tay. Update on Stevens-Johnson syndrome and toxic epidermal necrolysis in children. Curr Opin Pediatr. 2009;21:505-510
  • WL Chung, SSY Ng, MJA Koh, TT Liu, LH Peh. A review of patients managed at a combined psychodermatology clinic – A Singapore experience. Singapore Med J. 2012;53(12):789-793
  • WL Koh, MJA Koh, YK Tay. Pityriasis lichenoides in an Asian population. Int J Dermatol, 2013;52(12):1495-1499
  • TY Tan, H Zou, DC Ong, KJ Ker, MT Chio, RY Teo, MJ Koh. Development and clinical validation of a multiplex real-time PCR assay for herpes simplex and varicella zoster virus. Diagn Mol Pathol, 2013;22(4):245-248
  • SSY Ng, MJA Koh, YK Tay. Cutaneous Langerhans cell histiocytosis: study of Asian children shows good overall prognosis. Acta Paediatr, 2013;102(11):e514-518
  • MJA Koh, WS Chong. Narrow-band ultraviolet B phototherapy for mycosis fungoides in children. Clin Exp Dermatol 2014;39(4):474-478
  • YK Heng, MJA Koh, YC Giam, MBY Tang, WS Chong, SH Tan. Paediatric Mycosis Fungoides in Singapore: A Series of 46 Children. Pediatr Dermatol 2014;31(4):477-482
  • ZR Mok, MJA Koh, WS Chong. Is phototherapy useful in the treatment of atopic dermatitis in Asian children? A 5-year report from Singapore. Pediatr Dermatol, 2014;31(6):698-702
  • MJA Koh, ZR Mok, WS Chong. Phototherapy for the treatment of vitiligo in Asian children. Pediatr Dermatol, 2015;32(2):192-197
  • YW Foong, NWH Tan, CY Chong, KC Thoon, NWS Tee, MJA Koh. Melioidosis in children – A retrospective study. Int J Dermatol, 2015;54:929-938 • SSY Ng, YK Tay, MJA Koh, KC Thoon. Pediatric Cutaneous Non-tuberculous Mycobacterium Infections in Singapore. Pediatr Dermatol, 2015;32:488-494
  • Y Wong, MJA Koh, WS Chong. The role of narrow band ultraviolet B phototherapy in the treatment of psoriasis in Asian children. Pediatr Dermatol, 2015;32:e221-223
  • YL Teoh, RY Teo, B Yeo, KH Lim, MJ Koh. Elderly hospitalized patients – The impact of itch and its prevalence. Ann Acad Med Singapore, 2016;45:134-137
  • YK Tay, YC Chan, NS Chandran, MSL Ho, MJA Koh, YL Lim, MBY Tang, T Thirumoorthy. Guidelines for the management of atopic dermatitis in Singapore. Ann Acad Med Singapore, 2016;45:439-450
  • EXL Loo, JZT Sim, SL Loy, A Goh, YH Chan, KH Tan, PD Gluckman, KM Godfrey, H van Bever, BW Lee, YS Chong, LPC Shek, MJA Koh, SB Ang. Associations between caesarian delivery and allergic outcomes: results from the GUSTO study. Ann Allergy Asthma and Immunol, 2017;118:629-647
  • MSY Ng, YK Tay, SSY Ng, AYW Foong, MJA Koh. Comparison of two formulations of topical timolol for the treatment of infantile hemangiomas. Pediatr Dermatol 2017;34:492-493
  • MJA Koh, YC Giam, HM Liew, AYW Foong, JH Chong, SMY Wong, MBY Tang, MSL Ho, LS Tan, JM Mason, MJ Cork. Comparison of the simple patient-centric atopic dermatitis scoring system PEST with SCORAD in young children using a ceramide dominant therapeutic moisturizer. Dermatol Ther (Heidelb) 2017;7:383-393
  • JH Chong, MJA Koh. Non-topical management of recalcitrant paediatric atopic dermatitis. Arch Dis Child 2017:102(7):0
  • S Cheok, F Yee, JY Song Ma, R Leow, MSL Ho, YW Yew, YK Tay, N Luo, SA Rebello, MJA Koh. Prevalence and descriptive epidemiology of atopic dermatitis and its impact on quality of life in Singapore. Br J Dermatol 2018:178(1):276-277
  • CWX Tan, HM Liew, MJA Koh. A review of tinea capitis in a cohort of Asian children. Ann Acad Med Singapore 2018;47:156-158
  • MSY Ng, SY Tan, NHQ Chan, YW Foong, MJA Koh. Effect of atopic dermatitis on quality of life and its psychosocial impact in adolescent Asian children. Australas J Dermatol 2018;59:e114-e117
  • MJA Koh. Genodermatoses: a practical approach. Hong Kong J Dermatol Venerol 2018;26:59-66
  • JYV Cheong, SL Hie, EW Koh, NNA de Souza, MJA Koh. Impact of pharmacists’ counselling on caregiver’s knowledge in the management of pediatric atopic dermatitis. Pediatr Dermatol 2018;00:1-5
  • XD Han, MJA Koh, SMY Wong. Drug reaction with eosinophilia and systemic symptoms (DRESS) in a cohort of Asian children. Pediatr Dermatol 2019;36:324-329
  • X Xu, LS van Galen, MJA Koh, R Bajpai, S Thng, YW Yew, VPY Ho, U Alagappan, KSA Jarbrink, J Car. Factors influencing quality of life in children with atopic dermatitis and their caregivers: a cross-sectional study. Sci Rep 2019;9:15990
  • RP Namaduri, TY Lim, PK Yam, R Gatsinga, SK Lim-Tan, MJA Koh, S Mansor. Vulvar basal cell carcinoma: clinical features and treatment outcomes from a tertiary-care centre. Singapore Med J 2019;60:479-482
  • CWX Tan, DY Wang, AV Seghers, MJA Koh, SGN Goh, JSS Lee. Should we biopsy melanonychia striata in Asian children? A retrospective observational study. Pediatr Dermatol 2019;36:864-868
  • HL He, MJA Koh, HY Lee, SB Ang. Pilot study of a customized nanotextile wet garment treatment for moderate and severe atopic dermatitis – a randomized clinical trial. Pediatr Dermatol 2020;37:52-57
  • LS van Galen, X Xu, MJA Koh, J Car. Eczema apps conformance with clinical guidelines: a systematic assessment of functions, tools and content. Br J Dermatol 2020;182:444-453
  • M Olsson, R Bajpai, YW Yew, MJA Koh, S Thng, J Car, K Järbrink. Associations between health-related quality of life and healthcare costs among children with atopic dermatitis and their caregivers: a cross-sectional study. Pediatr Dermatol 2020;37:284-293
  • M Olsson, R Bajpai, LWY Wee, YW Yew, MJA Koh, S Thng, J Car, K Järbrink. The cost of childhood atopic dermatitis in a multi-ethnic Asian population: a cost-of-illness study. Br J Dermatol 2020;182:1245-1252
  • VPY Ho, E Ma, HM Liew, MSY Ng, MJA Koh. Comparing the potential for irritation of a ceramide-based moisturizer to a urea-based moisturizer for pediatric atopic dermatitis. Dermatol Ther (Heidelb) 2020;10:807-813
  • CY Woo, MJA Koh, WKY Fung, CS Chan, CB Chua, GT Tay, S Acharyya, GFH Chew, NKL Lee, KBL Lim. Effects of cast immobilization on skin barrier function. Ann Acad Med Singapore 2020;49:354-359
  • WM Salas-Walisundin, V Wong, JH Chong, MJA Koh. Steroid phobia in children with atopic dermatitis and their caregivers in Singapore. Dermatol Ther 2020;33:e13452
  • X Xu, K Griva, MJA Koh, E Lum, L van Galen, W Tan, S Thng, J Car. Creating a smartphone app for atopic dermatitis self-management: A participatory co-design approach with caregivers, healthcare professionals and researchers. JMIR mHealth and uHealth 2020 Oct 29;8(10):e16898
  • DF Murrell, AW Lucky, JC Salas-Alanis, DT Woodley, F Palisson, K Natsuga, M Nikolic, M Ramirez-Quizon, AS Paller, I Lara-Corrales, MA Barzegar, E Sprecher, C Has, M Laimer, AL Bruckner, A Bligic, D Purvis, A Nanda, A Hovnanian, S Murat-Sušić, J Bauer, JS Kern, C Bodemer, LK Martin, J Mellerio, C Kowaleski, SJ Robertson, L Bruckner-Tuderman, E Pope, P Marinkovich, JY Tang, J Su, J Uitto, LF Eichenfield, J Teng, MJA Koh, SE Lee, P Khuu, HI Rishel, M Sommerlund, K Wiss, C Hsu, TW Chiu, AE Martinez. Multidisciplinary care of Epidermolysis Bullosa during the COVID-19 Pandemic. J Am Acad Dermatol Oct;83:1222-1224
  • J Bao, YW Foong, JH Chong, MJA Koh. Systemic immunosuppressants for the treatment of atopic dermatitis in a cohort of Asian children. Dermatol Ther 2020;e13981
  • KR Soenjoyo, BWB Chua, LWY Wee, MJA Koh, SB Ang. Treatment of cutaneous viral warts in children: a review. Dermatol Ther 2020;e14034
  • X Xu, LS van Galen, R Bajpai, MJA Koh, STG Thng, YW Yew, K Järbrink, J Car. Factors influencing family burden of the paediatric atopic dermatitis patient: a cross-sectional study. Acta Derm Venereol 2020 Jul 28;100(14):adv00212
  • X Xu 1, M Olsson, R Bajpai, MJA Koh, YW Yew, S Wong, A Foong, S Thng, K Järbrink, J Car. Concordance Between Physician-rated and Caregiver-perceived Disease Severity in Children with Atopic Dermatitis: A Cross-sectional Study. Acta Derm Venereol 2020 Nov 4;100(18):adv00308
  • H Wei, AHM Lai, ES Tan, MJA Koh, I Ng, TW Ting, T Thomas, B Cham, JY Lim, S Kam, CYJ Goh, G Lin, M Brett, D Chan, SS Jamuar, EC Tan. Genetic Landscape of Congenital Disorders in Patients from Southeast Asia: Results from Sequencing Using a Gene Panel for Mendelian Phenotypes. Arch Dis Child 2021;106(1):38-46
  • D Luk, KLE Hon, MVC Dizon, KF Leong, YK Tay, MJA Koh, NS Chandran, S Wananukul, S Chatproedprai, T Luger. Practical recommendations for the topical treatment of atopic dermatitis in South and East Asia. Dermatol Ther (Heidelb) 2021;11(1):275-291
  • JMC Tan, HW Lim, MJA Koh. Oral propranolol for the treatment of infantile haemangiomas in Singapore. Singapore Med J 2021;62(3):139-142
  • SY Chia, LWY Wee, MJA Koh. Dupilumab for children and adolescents with atopic dermatitis: an Asian perspective. Dermatol Ther 2021;34(3):e14933
  • EY Lee, MJA Koh. Acute generalized exanthematous pustulosis in children and adolescents in Singapore: a ten-year retrospective study. Pediatr Dermatol 2021;38(2):424-430
  • S Ee, SSY Ng, YK Tay, EY Gan, A Santosa, NS Chandran, MJA Koh. Vitiligo in Asian children – a retrospective review. Australas J Dermatol 2021;62(3):409-410

Research Trials