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Thursday 3 April 2008


A 72-year-old man consulted for a rapidly enlarging tumor on his right forearm. The lesion appeared 3 to 4 months before.

The main clinical diagnosis was a keratoacanthoma.

Dermoscopy revealed:
  • a central brownish structureless area corresponding to a central mass of keratin
  • a whitish area with presence of elongated hairpin vessels

A central brownish structureless area (black circle) and hairpin vessels on a whitish background (white circle) are the two main dermoscopic signs in favor of a keratoacanthoma.

The diagnosis was confirmed by pathology after the complete excision of the tumor.