Lupus erythematosus profundus following thrombocytopenic purpura

A patient with thrombocytopenic purpura subsequently exhibited skin lesions of lupus erythematosus profundus, serositis, and serum antinuclear antibodies. Immunoglobulins and complement were found in the dermoepidermal junction of active skin lesions. Also of note was the presence of possible systemic lupus erythematosus in his mother.