Final answer:
A comedo, known as a cicatrix, is a type of pimple that includes blackheads due to oxidation. It is caused by clogged hair follicles with shed skin cells and sebum.
Explanation:
A cicatrix, also known as a comedo, is a type of pimple that can take the form of a blackhead. Comedones are non-inflammatory lesions that occur when hair follicles become clogged by shed skin cells and sebum. Whitehead comedones are covered by skin, while blackhead comedones are not and appear black due to the oxidation of lipids in the clogged follicle exposed to air.
Learn more about Comedones and skin conditions here:
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