A type of acne lesion characterized by a closed pore filled with oil and dead skin cells, appearing as a small white bump.
English compound word from 'white' + 'head', describing the appearance of the lesion. The term became standardized in dermatological terminology in the 20th century as medical understanding of acne improved.
Whiteheads form when a pore becomes completely blocked, creating an anaerobic environment that's different from blackheads, which have open pores exposed to air. The white appearance comes from the keratin and sebum mixture being sealed beneath the skin, preventing oxidation that would turn it dark.
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