acne vulgaris

noun

acne vul·​gar·​is -ˌvəl-ˈgar-əs, -ˈger- 

plural acnae vulgares -ˈgar-ˌēz, -ˈger- 

: a chronic acne involving mainly the face, chest, and shoulders that is common in adolescent humans and various domestic animals and is characterized by the intermittent formation of discrete papular or pustular lesions often resulting in considerable scarring