A man in his 50s of Indian descent presented with a pruritic eruption on his scalp, arms, neck, and feet. The eruption began during the summer 3 months before presentation. His medical history was significant for type 2 diabetes mellitus and hypertension, which were managed with metformin, glimepiride, and atenolol.
Physical examination revealed hyperpigmented annular plaques with violaceous borders on his scalp and the superior part of his forehead (Figure, A). There were violaceous papules on the dorsal aspect of the hands (Figure, B), extensor surface of the arms, and the nape of the neck.
Ekpo FE, Cibull TL, Kaminska ECN. Violaceous Eruption on the Head and Extremities. JAMA Dermatol. 2015;151(10):1121-1122. doi:10.1001/jamadermatol.2015.2104