Linear sebaceous hyperplasia on the chest

Case 1 A 39-year-old Japanese man presented with 6-month history of a group of papules on the chest (Figure 1A). The patient had no specific symptoms, such as itching or tenderness, but visited the clinic worried about the long duration of the lesions. Physical examination showed pinkish white, firm papules of 5 to 10 mm in diameter with sharply demarcated borders. The surface of the papules was smooth and shiny. Dermoscopic examination demonstrated aggregation of yellowish-white clods with linear vessels between or above the clods exhibiting reticular distribution as a whole (Figure 1B). Other papules also showed similar features. High dynamic range (HDR) [1,2] conversion of the dermoscopy photograph further clarified the multi-lobulated clods with a central opening (Figure 1C). Histopathological examination of the biopsied lesions established the diagnosis of sebaceous hyperplasia (SH) (Figure 1D). Based on the clinical, dermoscopic and histopathological findings, the final diagnosis was linear SH on the chest.