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acne vul·gar·is | \ -ˌvəl-ˈgar-əs, -ˈger- 
\
\ plural acnae vulgares\ -ˈgar-ˌēz, -ˈger- \
\Medical Definition of acne vulgaris
: 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
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