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tinea incognito
Tinea incognito is a fungal infection (mycosis) of the skin caused by the presence of a topical immunosuppressive agent. The usual agent is a topical corticosteroid (topical steroid). As the skin fungal infection has lost some of the characteristic features due to suppression of inflammation, it may have a poorly defined border, skin atrophy, telangiectasia, and florid growth. Occasionally, secondary infection with bacteria occurs with concurrent pustules and impetigo.〔Habif, T. P. (1995) ''Clinical Dermatology''. Mosby, 3rd ed.; pp. 41-42.〕
== Diagnosis ==
Clinical suspicion arises especially if the eruption is on the feet, ankle, legs, or groin. A history of topical steroid or immunosuppressive agent is noted.
Confirmation is with a skin scraping and microscopic exam with potassium hydroxide solution. Characteristic hyphae are seen running through the squamous epithelial cells. Fungal culture is not necessary, but might be considered if the patient is using a combination antifungal and topical steroid product.
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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