Final answer:
Comedones, also known as follicular hyperkeratosis, are a type of skin lesion commonly associated with acne. They occur when hair follicles become clogged with sebum and dead skin cells, resulting in the formation of non-inflammatory lesions called comedones. Comedones can take the form of whiteheads or blackheads.
Step-by-step explanation:
Comedones, also known as follicular hyperkeratosis, are a type of skin lesion commonly associated with acne. They occur when hair follicles become clogged with sebum and dead skin cells, resulting in the formation of non-inflammatory lesions called comedones. Comedones can take the form of whiteheads, which are covered by skin, or blackheads, which are not covered and appear black due to oxidation of lipids. These clogged follicles can become infected by acne-causing bacteria, leading to inflammation and the development of pustules, nodules, or cysts.