an inflammatory disease of the sebaceous glands, characterized by comedones and pimples, especially on the face, back, and chest, and, in severe cases, by cysts and nodules resulting in scarring.
Origin: 1820–30; < Neo-Latin < Late Greek aknás, a manuscript error for akmás, accusative plural of akmḗ facial eruption, probably to be identified with Greek akmḗacme