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Blanching maculopapular rash with well-circumscribed lesions, forming characteristic target lesions (ie central clearing, or alternating rings) which may blister.
In its severe form, there may be oral and genital ulceration: Stevens-Johnson syndrome. Usually idiopathic, but can be associated with:
- herpes simplex infection
- hepatitis B infection
- drugs esp penicillin, salicylates, phenobarbitone
- systemic lupus erythematosus
Self-limiting, typically lasting a week or two. No evidence that steroids help.