Key points A 69-year-old man presented to a dermatology clinic with a 1-day history of a painful erythematous rash. Four days before the rash appeared, he had begun Helicobacter pylori eradication therapy with amoxicillin, clarithromycin, and omeprazole. Staff at a local clinic suspected drug
Ruan et al. (Sun,) studied this question.
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