acne

n. skin disorder characterized by pimples and other pustular eruptions which generally appear on the face (also acnae)

Acne Vulgaris is an inflammatory disease of the skin, caused by changes in the pilosebaceous units (skin structures consisting of a hair follicle and its associated sebaceous gland). Acne lesions are commonly referred to as pimples, spots, plooks or "zits".Acne develops as a result of blockages in follicles. Hyperkeratinization and formation of a plug of keratin and sebum (a microcomedo) is the earliest change. Enlargement of sebaceous glands and an increase in sebum production occur with increased androgen (DHEA-S) production at adrenarche. The microcomedo may enlarge to form an open comedo (blackhead) or closed comedo (whitehead). Increased sebum production provides an environment for the overgrowth of Propionibacterium acnes. Bacterial overgrowth of Propionibacterium acnes can cause inflammation, leading to inflammatory lesions (papules, pustules, or nodules) in the dermis around the microcomedo or comedo, which may result in scarring.
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Acne is a common skin disease characterized by pimples on the face, chest, and back. [more]Acne - Community and Resources

Noun
1. an inflammatory disease involving the sebaceous glands of the skin; characterized by papules or pustules or comedones
(hypernym) skin disease, disease of the skin, skin disorder, skin problem, skin condition
(hyponym) acne rosacea, rosacea
(part-meronym) pimple, hickey

n. acne, skin disorder characterized by pimples and other pustular eruptions which generally appear on the face