fixed drug eruption
Definition: a type of drug eruption that recurs at the same site (or sites) following the administration of a particular drug; the lesions usually consist of intensely erythematous and purplish, sharply demarcated macules, and occasionally of herpetic vesicles; the affected areas undergo gradual involution, but flare and enlarge on readministration of the offending drug and may become hyperpigmented.
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Examples: glitazone, GI cocktail, etc.