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Dyshidrosis (, also known as "acute vesiculobullous hand eczema,"〔James, William; Berger, Timothy; Elston, Dirk (2005). ''Andrews' Diseases of the Skin: Clinical Dermatology'' (10th ed.). Saunders. ISBN 0-7216-2921-0.〕 "cheiropompholyx,"〔 "dyshidrotic eczema,"〔 "pompholyx,"〔 and "podopompholyx") is a skin condition that is characterized by small blisters on the hands or feet. It is an acute, chronic, or recurrent dermatosis of the fingers, palms, and soles, characterized by a sudden onset of many deep-seated pruritic, clear vesicles; later, scaling, fissures and lichenification occur. Recurrence is common and for many can be chronic. Incidence/prevalence is said to be 1/5,000 in the United States. However, many cases of eczema are diagnosed as garden-variety atopic eczema without further investigation, so it is possible that this figure is misleading. This condition is not contagious to others, but the compromised integument can increase susceptibility to infection, and the accompanying itching can be a source of psychological distress. The name comes from the word "dyshidrotic," meaning "bad sweating," which was once believed to be the cause, but this association is unproven; there are many cases present that have no history of excessive sweating. There are many different factors that may trigger the outbreak of dyshidrosis such as allergens, physical and/or mental stress, or seasonal changes. ==Signs and symptoms== Small blisters with the following characteristics: * Blisters are very small (3 mm or less in diameter). They appear on the tips and sides of the fingers, toes, palms, and soles. * Blisters are opaque and deep-seated; they are either flush with the skin or slightly elevated and do not break easily. Eventually, small blisters come together and form large blisters. * Blisters may itch, cause pain, or produce no symptoms at all. They worsen after contact with soap, water, or irritating substances. * Scratching blisters breaks them, releasing the fluid inside, causing the skin to crust and eventually crack. This cracking is painful as well as unsightly and often takes weeks, or even months to heal. The skin is dry and scaly during this period. * Fluid from the blisters is serum that accumulates between the irritated skin cells. It is not sweat as was previously thought. * In some cases, as the blistering takes place in the palms or finger, lymph node swelling may accompany the outbreak. This is characterised by tingling feeling in the forearm and bumps present in the arm pits. * Nails on affected fingers, or toes, may take on a pitted appearance. File:DyshidroticDermatitisOnHandsLateStage.jpg|Advanced stage of dyshidrosis on the fingers File:Dyshidrosis.JPG|Palmar dyshidrosis File:Palmar dyshidrosis peeling stage.JPG|Advanced stage of palmar dyshidrosis on the palm showing cracked and peeling skin File:Dyshidrosis late stage.jpg|Advanced stage of dyshidrosis on the foot. File:Rim of scale on plantar surface of thumb.jpg|Rim of scale on the palmar surface of the thumb from a resolving dyshidrotic flare 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「Dyshidrosis」の詳細全文を読む スポンサード リンク
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