A 13-year-old white boy presented with a 3-year history of recurrent attacks of sweating localized on the right forearm. He experienced several episodes of sweating daily at the affected site, with each attack lasting for about 20 minutes. Relapses occurred spontaneously but were aggravated occasionally by exercise, emotional factors, and increased environmental temperature. His medical history was unremarkable. Physical examination performed during an inactive period revealed no abnormalities; evaluation performed during a spontaneous paroxysmal attack revealed a localized sharply demarcated area of severe hyperhidrosis on the lateral aspect of the forearm. The underlying skin was normal.
Borrego L, López-Estebaranz JL, Vicente J, Sols M, Pinedo F. Focal Recurrent Episodic Hyperhidrosis on the Forearm. Arch Dermatol. 2001;137(9):1241-1246. doi: