• Fellowship in Hair and Scalp Pathology (Melbourne, Australia), 2020
• Grad Dip in Mental Health (NUS), 2019
• Specialist Accreditation in Dermatology (Singapore), 2017
• MRCP (UK), 2014
• MRCPS (Glasg), 2014
• MBBS (Singapore), 2008

• Clinical Lecturer, NUS Yong Loo Lin School of Medicine
• Fellow, Chapter of Dermatologists, Academy of Medicine, Singapore
• Member, Dermatological Society of Singapore
• Member, Singapore Medical Association
• Member, Asian Society of Pediatric Dermatology
• Member, International Society of Pediatric Dermatology
• Member, Australasian Hair and Wool Research Society
• Member, American Hair Research Society
• Member, Dermatology Department Mortality & Morbidity Committee
• Member, CGH Handover Committee
• Member, Medical Hand Hygiene Taskforce
• Infection Prevention and Control Representative for Department

• SingHealth 10-year Long Service Award
• Singapore Health Quality Service Awards 2020: Star Award
• Singapore Health Quality Service Awards 2019: Gold Award
• Recipient of the 2017 American Academy of Dermatology International Scholarship for the American Academy of Dermatology Meeting, Orlando, Florida
• Eastern Health Alliance Caring Awards 2016: Silver Award
• Eli Lilly Gold Medal and Book Prize (Top Undergraduate Student in Psychiatry)

• S Vano-Galvan, R Pirmez, A Hermosa-Gelbard, OM Moreno-Arrones, D Saceda-Corralo, R Rodrigues-Barata, J Jimenez-Cauhe, WL Koh et al. Safety of low-dose oral minoxidil for hair loss: a multicentre study of 1404 patients. J Am Acad Dermatol. Article in Press. Published 2021 Feb 24. doi: https://doi.org/10.1016/j.jaad.2021.02.054

• J Kee, WL Koh , WL Kok. A swollen head - more than meets the eye. Ann Acad Med Singap 2020; 49: 1052-3.

R Jerjen, WL Koh , R Sinclair, B Bhoyrul. Low-dose oral minoxidil improves global hair density and length in children with loose anagen hair syndrome. Br J Dermatol 2020 Dec 24. doi: 10.1111/bjd.19756. Online ahead of print.

• R Jerjen, WL Koh , R Sinclair. Effective treatment of disseminated superficial actinic porokeratosis using a novel topical cholesterol/simvastatin combination cream. Australas J Dermatol 2020 Sep 27. doi: 10.1111/ajd.13473. Online ahead of print.

• CJ Park, WL Koh , YK Tay, EKM Wuan, RSP Lim. A review of cases seen at a psychodermatology clinic in Singapore. Asian J Psychiatr 2020; 50: 101955.

• WL Koh , HH Oon, WP Tan. Acitretin-altered squamous cell carcinoma: a pitfall in diagnosis. Dermatol Surg 2019; 45(2): 311-3.

SH Koo, YL Teoh, WL Koh , H Ochi, SK Tan, D Miao, F Sim, B Jiang, AL Tan, TY Tan, SPR Lim. Development and validation of a real-time multiplex PCR assay for the detection of dermatophytes and fusarium spp. J Med Microbiol 2019; 68(11): 1641-8.

• WL Koh , YK Tay. Epidermolysis bullosa simplex, Dowling-Meara, mimicking epidermolysis bullosa simplex with mottled pigmentation - A case report. J Dermatol Dermatol Surg 2019; 23: 106-8.

• WL Koh , YK Tay, CS Sim. Solitary mastocytoma arising from a tight infant identification bracelet. Indian J Paediatr Dermatol 2018; 19(3): 258-60.

• WL Koh, HB Oon, WP Tan. Erosion-like squamous cell carcinoma in an acitretin treatment psoriasis patient. Dermatol Bulletin 2017; 28(1): 30-31.

• WL Koh, YK Tay, CS Sim. Solitary mastocytoma arising from a tight infant identification bracelet. Indian J Paediatr Dermatol. doi: 10.4103/ijpd.IJPD_85_17. [Epub ahead of print]

• WL Koh, YK Tay, VWL Ng. Pancreatic panniculitis sans pancreatitis in a newly diagnosed diabetes mellitus patient. Ann Acad Med Singapore 2017; 46:252-3.

• WL Koh, CC Ang, SPR Lim. A rare case of occupational contact urticaria syndrome caused by meranti wood dust. Contact Dermatitis 2016; 75(1): 56-8.

• PM Yeo, WL Koh, SPR Lim. Tramadol-induced peripheral oedema. Clin Exp Dermatol 2016; 41(5): 557-8.

• PM Yeo, WL Koh, CC Ang, SPR Lim. Paradoxical worsening of truncal acne with doxycycline. Ann Acad Med Singapore 2016; 45: 430-1.

• YZ Pang, WL Koh, CC Ang. Idiopathic eruptive macular pigmentation with papillomatosis (IEMPP): A controversial entity. Dermatol Online J 2016; 22(4).

• WL Koh, SPR Lim. Dramatic hyperpigmentation of keloids after intralesional triamcinolone acetonide injection. Dermatol Online J 2015; 21(5).

• WL Koh, YK Tay, MJA Koh. Danazol-induced Stevens-Johnson syndrome in a patient with systemic lupus erythematosus. Dermatol Online J 2015; 21(1).

• WL Koh, MJA Koh, YK Tay. Pityriasis lichenoides in an Asian population. Int J Dermatol 2013; 52(12): 1495-9.

• WL Koh, YK Tay, MJA Koh, CS Sim. Cutaneous pseudolymphoma occurring after traumatic implantation of a foreign red pigment. Singapore Med J 2013; 54(5): e100-1.

• WL Koh, CC Ang, SPR Lim. Psoriasiform dermatitis in a case of newly diagnosed locally advanced pyriform sinus tumour: Bazex syndrome revisited. Singapore Med J 2012; 53(1): e12-14.

• WL Koh, TT Liu, YK Tay. Formication due to true parasitic infestation: Bird mites. Arch Dermatol 2011; 147(4): 508-9.

• WL Koh, TT Liu. A cured patient who came back for consultation: neuropathic scrotal pruritus relieved after ipsilateral inguinal hernia repair. Int J STD AIDS 2010; 21(9): 658-9.

• SPW Kumarasinghe, WL Koh, CSJ Teo. Significance of Acinetobacter spp. in bacterial culture reports – a clinical perspective. Ind J Wound Management 2006; 1(2): 5-12.

• SPW Kumarasinghe, WL Koh, CSJ Teo, SH Chua. Acquired Bilateral Naevus Of Ota-Like Macules (Hori’s Naevus). Dermatol Bulletin 2007; 18(2): 9-12.

• M Katory, CL Tang, WL Koh, et al. A 6-year review of surgical morbidity and oncological outcome after high anterior resection for colorectal malignancy with and without splenic flexure mobilization. Colorectal Disease 2007; 10(2): 165-9.

• Site-Principal Investigator: M18-891 (Measure Up 2) – A phase 3 randomized, placebo-controlled, double-blind study to evaluate Upadacitinib in adolescent and adult subjects with moderate to severe atopic dermatitis.
• Co-investigator: Development of a real-time multiplex PCR for the detection of dermatophytes and Fusarium spp.