A 6-month-old exclusively breastfed boy was brought to the dermatology department for evaluation of red, oozy plaques over his face, genitals, and extremities of 4 months duration. He was small for gestational age at birth, and was born of a nonconsanguineous marriage. At presentation, his length was 58 cm and weight was 4.5 kg (both below the third percentile for age). Cutaneous examination revealed sharply demarcated, fissured, erythematous plaques on the perioral, perianal, and inguinal skin, some with associated honey-colored crusting (Figure). In addition, paronychia and diffuse alopecia and crusting of the parieto-occipital scalp was noted.