Clinical features, culprit drugs, and allergology workup in 41 cases of fixed drug eruption

Abstract

BACKGROUND: Fixed drug eruption (FDE) represents a drug-related cutaneous reaction. Many drugs been associated with this clinical entity, with continually evolving documentation of implicated agents and clinical presentations. A bullous form can occur although it is rare. OBJECTIVES: To assess the epidemiological and clinical characteristics of FDE. METHODS: We retrospectively analysed all FDE cases who presented to the Clinical Pharmacology Department at the University Hospital, Monastir, Tunisia, for allergy workup. RESULTS: The mean age of the 41 confirmed FDE cases was 43.8 ± 15.5 years. The time between first lesion onset and FDE diagnosis was less than 1 month for 13 patients (31.7%). Fifteen patients had bullous lesions. The upper limbs were the most common location (65.9% of cases). The patch tests were positive in 27 cases; a provocation test yielded a positive response in the four cases tested. Nonsteroidal anti-inflammatory drugs (NSAIDs) were involved in 51.2%, antibiotics in 24.4%, and other analgesics in 19.5%. The most common offending drug was mefenamic acid in 24.4% of cases. Bullous lesions were significantly associated with paracetamol intake (P = .014; odds ratio 16.7; 95% confidence interval: 1.76-158). CONCLUSIONS: NSAIDs and antibiotics were the most implicated in inducing FDE; paracetamol was associated with bullous lesions.