Acne vulgaris is the medical name for common acne -- the presence of blackheads, whiteheads, and other types of pimples on the skin. A comedo, or basic acne lesion, is a hair follicle that has become clogged with oil and dead skin cells. Comedones (the plural of comedo) can develop.
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Whiteheads (closed comedones) are the earliest lesions of acne. This image displays small, slightly elevated lesions and scars in an adult with chronic acne.