LAUSR

A 22-year-old, otherwise healthy male, presented with acute onset of a rash on the chin associated with a burning sensation. Dermatological examination revealed multiple vesicular lesions on erythematous ground and a few acneiform lesions (Figure 1). The patient had applied the milky sap of a plant to his chin to treat acne vulgaris and the eruption started on the same site nearly 12 hours later. The plant was specified as E. Trigona Mill (Figure 2). An open test with the milky sap of the plant confirmed the diagnosis. The sap was applied “as is” to the patient's upper back and left uncovered. The test area was examined after 4, 8, 12, and 24 hours. A vesicular reaction was observed after 8 hours and peaked 12 hours after exposure. The patient was advised to use only a ceramide-containing emollient and the lesions resolved completely within a week.