Acne
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From Wikipedia, the free encyclopedia |
Acne vulgaris (commonly called acne) is a
common human skin disease, characterized by areas of skin with multiple
noninflammatory follicular papules or comedones and by inflammatory papules,
pustules, and nodules in its more severe forms. Acne vulgaris mostly affects
the areas of skin with the densest population of sebaceous follicles; these
areas include the face, the upper part of the chest, and the back. Severe
acne is inflammatory, but acne can also manifest in noninflammatory
forms.[1] Acne lesions are commonly referred to as pimples, blemishes,
spots, zits, or simply acne. Acne lesions are caused by changes in
pilosebaceous units, skin structures consisting of a hair follicle and its
associated sebaceous gland, changes which require androgen stimulation.
Acne occurs most commonly during adolescence, affecting more than 89% of
teenagers, and frequently continues into adulthood. In adolescence, acne is
usually caused by an increase in male sex hormones, which people of both
genders accrue during puberty.[2] For most people, acne diminishes over time
and tends to disappear—or at the very least decrease—after one reaches one's
early twenties. There is, however, no way to predict how long it will take
to disappear entirely, and some individuals will carry this condition well
into their thirties, forties and beyond.[3]
The face and upper neck are the most commonly affected, but the chest, back
and shoulders may have acne as well. The upper arms can also have acne, but
lesions found there are often keratosis pilaris, not acne. Typical acne
lesions are comedones, inflammatory papules, pustules and nodules.
Some of the large nodules were previously called "cysts" and the term
nodulocystic has been used to describe severe cases of inflammatory acne.[4]
The "cysts," or boils that accompany cystic acne, can appear on the
buttocks, groin, and armpit area, and anywhere else where sweat collects in
hair follicles and perspiration ducts.[5] Cystic acne affects deeper skin
tissue than does common acne.[6]
Aside from scarring, its main effects are psychological, such as reduced
self-esteem[7] and, according to at least one study, depression or
suicide.[8] Acne usually appears during adolescence, when people already
tend to be most socially insecure. Early and aggressive treatment is
therefore advocated by some to lessen the overall impact to individuals.[7]
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Acne Vulgaris |
Acne
vulgaris (commonly
called acne) is a common human skin disease, characterized by areas of skin
with multiple noninflammatory follicular papules or ... |
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