A patient presents with purple papular lesions on his face and upper trunk measuring 1-2 cm across. They aren’t painful or itchy. What is the single most likely diagnosis?

The key is A. Kaposis sarcoma. [It is a spindle-cell tumour derived from capillary endothelial cells or from fibrous tissue, caused by human herpes virus. It presents as purple papules (1⁄2 to 1 cm) or plaques on skin and mucosa (any organ). It metastasizes to nodes. OHCM 9th edition, page 716].