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Pityriasis rosea (also known as pityriasis rosea Gibert) is a skin rash. It is benign but may inflict substantial discomfort in certain cases.〔 Classically, it begins with a single "herald patch" lesion, followed in 1 or 2 weeks by a generalized body rash lasting up to 12 weeks, however usually around 6 - 8.〔〔〔 ==Signs and symptoms== The symptoms of this condition include: * An upper respiratory tract infection may precede all other symptoms in as many as 69% of patients. * A single, 2- to (rarely) 10-cm oval red "herald" patch appears, classically on the abdomen.〔〔 Occasionally, the "herald" patch may occur in a 'hidden' position (in the armpit, for example) and not be noticed immediately. The "herald" patch may also appear as a cluster of smaller oval spots, and be mistaken for acne. Rarely, it does not become present at all.〔 * 7–14 days after the herald patch, many small (5–10 mm) patches of pink or red, flaky, oval-shaped rash appear on the torso.〔 In 6% of cases an inverse distribution may occur, with rash mostly on the extremities. The more numerous oval patches generally spread widely across the chest first, following the rib-line in a characteristic "christmas-tree" distribution.〔 Small, circular patches may appear on the back and neck several days later. It is unusual for lesions to form on the face, but they may appear on the cheeks or at the hairline. * About one in four people with PR suffer from mild to severe symptomatic itching. (Moderate itching due to skin over-dryness is much more common, especially if soap is used to cleanse the affected areas.) The itching is often non-specific, and worsens if scratched. This tends to fade as the rash develops and does not usually last through the entire course of the disease.〔 * The rash may be accompanied by low-grade fever, headache, nausea and fatigue. Over-the-counter medications can help manage these.〔 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「pityriasis rosea」の詳細全文を読む スポンサード リンク
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