What is the term for a blackhead as seen in acne?

The term for a blackhead in the context of acne is "comedo." A comedo is a type of acne lesion that forms when a hair follicle becomes clogged with oil, dead skin cells, and bacteria. In the case of a blackhead, the clogged material is exposed to air, which causes it to oxidize and turn black. This characteristic distinguishes blackheads from other types of acne, such as papules and pustules, which may be red and inflamed. Understanding this terminology is important in the study of dermatological conditions, as it helps in accurately identifying and treating various forms of acne.

The other terms listed describe different types of skin lesions or conditions but do not refer specifically to blackheads. For example, a papule is a small, raised, solid pimple or swelling on the skin, while a macule is a flat, distinct, discolored area of skin. Miliria, commonly known as heat rash, is a condition that arises from blocked sweat glands.