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A rash is a change of the skin which affects its color, appearance, or texture. A rash may be localized in one part of the body, or affect all the skin. Rashes may cause the skin to change color, itch, become warm, bumpy, chapped, dry, cracked or blistered, swell, and may be painful. The causes, and therefore treatments for rashes, vary widely. Diagnosis must take into account such things as the appearance of the rash, other symptoms, what the patient may have been exposed to, occupation, and occurrence in family members.Rash can last 5 to 20 days, the diagnosis may confirm any number of conditions. The presence of a rash may aid diagnosis; associated signs and symptoms are diagnostic of certain diseases. For example, the rash in measles is an erythematous, morbilliform, maculopapular rash that begins a few days after the fever starts. It classically starts at the head, and spreads downwards. == Differential diagnosis == Common causes of rashes include: * Food Allergy * Anxiety * Allergies, for example to food, dyes, medicines, insect stings, metals such as zinc or nickel; such rashes are often called hives. * Skin contact with an irritant * * Fungal infection, such as ringworm * * Balsam of Peru * Reaction to vaccination * Skin diseases such as eczema or acne * Exposure to sun (sunburn) or heat * Friction due to chafing of the skin * Irritation such as caused by abrasives impregnated in clothing rubbing the skin. The cloth itself may be abrasive enough for some people * Menstruation * Secondary syphilis * Poor personal hygiene Uncommon causes: * Autoimmune disorders such as psoriasis * Lead poisoning * Pregnancy * Repeated scratching on a particular spot * Lyme Disease * Scarlet fever 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「rash」の詳細全文を読む スポンサード リンク
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