Final answer:
An open comedone is the technical name for a blackhead. It occurs when hair follicles become clogged with shed skin cells and sebum, resulting in non-inflammatory lesions called comedones.
Step-by-step explanation:
An open comedone is the technical name for a blackhead. Acne occurs when hair follicles become clogged by shed skin cells and sebum, causing non-inflammatory lesions called comedones. Blackhead pimples are not covered by skin, and the black color occurs when lipids in the clogged follicle become exposed to the air and oxidize.