Filed from 3 published puzzles

ACNES

Set to 3 different clues across 3 published puzzles, most often “Dermatologists' concerns” — The New York Times, Wednesday, 20 July 2011.

5 letters

Every clue on record, most used first

Dermatologists' concernsonce
The New York Times — Wednesday, 20 July 2011
Stridex targetsonce
The New York Times — Sunday, 8 May 2005
Rosacea and othersonce
The New York Times — Sunday, 12 August 2001