| Summary: | Fixed drug eruption (FDE) is a type of drug reaction in which cutaneous or mucocutaneous lesions recur at the same site due to repeated administration of the causative drug. The most reported FDE-inducing drugs are nonsteroidal anti-inflammatory drugs (NSAIDs). We report a case of FDE associated with the use of NSAIDs for menstrual pain. A 33-year-old woman was referred to our department with blisters and soreness on her lips, tongue, and labial mucosa. The results of blood examination helped rule out herpes simplex virus infection, pemphigus, and pemphigoid. An FDE was suspected because these symptoms coincided with the use of NSAIDs for menstrual pain. Thus, the patient was advised not to use these NSAIDs but to use acetaminophen instead. No recurrence has been observed since the patient began avoiding these NSAIDs.
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