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A chronic painless plaque on the finger

BMJ 2022; 377 doi: (Published 25 May 2022) Cite this as: BMJ 2022;377:e070245
  1. Xiaoting Song, resident dermatologist,
  2. Aiping Wang, consultant dermatologist
  1. Department of Dermatology and Venereology, Peking University First Hospital, Beijing, China
  1. Correspondence to: A Wang wangap516{at}

This is an extragenital chancre on the right middle finger of a man in his late teens (fig 1). He presented with a six month history of a painless lesion that began as a vesicle but formed into a plaque after being punctured. …

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