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A pilonidal cyst, also referred to as a pilonidal abscess, pilonidal sinus or sacrococcygeal fistula, is a cyst or abscess near or on the natal cleft of the buttocks that often contains hair and skin debris. ==Signs and symptoms== Pilonidal cysts are often very painful, and typically occur between the ages of 15 and 35.〔 Although usually found near the coccyx, the condition can also affect the navel, armpit or genital region, though these locations are much rarer. Symptoms include: *Pain/discomfort or swelling above the anus or near the tailbone that comes and goes *Opaque yellow (purulent) or bloody discharge from the tailbone area *Unexpected moisture in the tailbone region *Discomfort with sitting on the tailbone, doing sit-ups or riding a bike (any activities that roll over the tailbone area) Some people with a pilonidal cyst will be asymptomatic. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pilonidal cyst」の詳細全文を読む スポンサード リンク
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