A Case for Diagnosis (Erythema Multiforme Bullosum?). Presented by Dr. Jacob Skeer. M. G., a white girl aged 3½ years, was first admitted to Cumberland Hospital on June 21, 1943. Her past history revealed that she had been in good health until March 1943, when she had whooping cough. She was taken to Kingston Avenue Hospital, where a "severe vesicular eruption" with a red indurated base developed. The rash spread to the extremities and was diagnosed as erythema multiforme bullosum. After the whooping cough cleared, the patient was transferred to Kings County Hospital, where a similar diagnosis was made. There studies revealed a positive culture of Staphylococcus aureus from the cutaneous lesion, and a biopsy of the lesion was reported as showing a dermatitis of unknown type. The patient remained in Kings County Hospital until June 19, and her condition remained unchanged following treatment with sulfathiazole ointment, gentian