Ethambutol-induced lichenoid eruption

Abstract
The tuberculostatic drug ethambutol is an infrequent skin offender. A lichenoid skin eruption restricted to the light-exposed areas in a 67-year-old male was proved by withdrawal and challenge to be caused by ethambutol. Patch tests with ethambutol 0.1%, 0.5% and 1% in watery solution were negative.

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