acne
Acne , also known as acne vulgaris , is a long-term skin condition that occurs when dead skin cells and oil from the skin clog hair follicles . [10] Typical features of the condition include blackheads or whiteheads , pimples , oily skin, and possible scarring . [1] [2] [11] It primarily affects skin with a relatively high number of oil glands , including the face, upper part of the chest, and back. [12] The resulting appearance can lead to anxiety , reduced self-esteem , and, in extreme cases, depression or thoughts of suicide . [3] [4] Susceptibility to acne is primarily genetic in 80% of cases. [2] The role of diet and cigarette smoking in the condition is unclear, and neither cleanliness nor exposure to sunlight appears to play a part. [2] [13] [14] In both sexes , hormones called...