Pseudoephedrine-induced Fixed Drug Eruption in a Scuba Diver With Recurrent Palmoplantar Exfoliation.

Objectives: This report presents a case of pseudoephedrine-induced nonpigmented bullous fixed drug eruption (NBFDE) manifesting as recurrent palmoplantar exfoliation in a scuba diver. It emphasizes the importance of considering drug allergies in the differential diagnosis when divers present with peeling hands and soles.

Methods: A 38-year-old female scuba diver experiencing recurrent palmoplantar exfoliation underwent a clinical evaluation, patch testing, an interferon-gamma enzyme-linked immunospot (ELISpot) assay, and graded drug challenges with pseudoephedrine and phenylephrine.

Results: Patch testing yielded negative results; however, the ELISpot assay indicated a strong immune response to pseudoephedrine. A graded challenge involving pseudoephedrine successfully reproduced the symptoms, confirming a diagnosis of pseudoephedrine-induced NBFDE. Subsequently, a challenge with phenylephrine elicited a milder reaction, suggesting it as a potential alternative medication for the patient.

Conclusions: This case highlights NBFDE as a potential cause of skin peeling in scuba divers who are allergic to pseudoephedrine. It emphasizes the importance of considering drug allergies when diagnosing palmoplantar exfoliation in divers and underscores the need for a thorough evaluation of medication use in this group. Alternative medications and management strategies should be considered for divers with a pseudoephedrine allergy to prevent ear barotrauma while minimizing the risk of adverse skin reactions.