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keratosis pilaris
Keratosis pilaris (KP) (also follicular keratosis, lichen pilaris, or colloquially "chicken skin") is a common, autosomal dominant, genetic follicular condition characterized by the appearance of rough, slightly red bumps on light skin and brown bumps on darker skin. It most often appears on the back, outer sides of the upper arm (though the forearm can also be affected), face, thighs, and buttocks;〔 KP can also occur on the hands, and tops of legs, sides, or any body part except glabrous skin (like the palms or soles of feet). Often the lesions will appear on the face, which may be mistaken for acne.
==Signs and symptoms==
Keratosis pilaris results in small bumps on the skin that feel like rough sandpaper. They are skin-colored bumps the size of a grain of sand, many of which are surrounded by a slight pink color in light skinned people and dark spots in dark skinned people.〔 Most people with keratosis pilaris do not have symptoms but the bumps in the skin can occasionally be itchy.〔
Though people with keratosis pilaris experience the condition year-round, the problem can become exacerbated and the bumps are likely to look and feel more pronounced in color and texture during the colder months, when moisture levels in the air are lower.〔http://www.nhs.uk/conditions/keratosis-pilaris/Pages/Introduction.aspx〕 The symptoms may also worsen during pregnancy or after childbirth.〔"Cysts, Lumps, Bumps, and Your Skin". ''WebMD. ''Retrieved 2013-10-31. 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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