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Tinea versicolor (also known as dermatomycosis furfuracea,〔 pityriasis versicolor,〔 and tinea flava) is a condition characterized by a skin eruption on the trunk and proximal extremities.〔 Recent research has shown that the majority of tinea versicolor is caused by the ''Malassezia globosa'' fungus, although ''Malassezia furfur'' is responsible for a small number of cases. These yeasts are normally found on the human skin and only become troublesome under certain circumstances, such as a warm and humid environment, although the exact conditions that cause initiation of the disease process are poorly understood.〔 The condition pityriasis versicolor was first identified in 1846. Versicolor comes from the Latin, from ''ラテン語:versāre'' to turn + color. ==Signs and symptoms== The symptoms of this condition include: * Occasional fine scaling of the skin producing a very superficial ash-like scale * Pale, dark tan, or pink in color, with a reddish undertone that can darken when the patient is overheated, such as in a hot shower or during/after exercise, tanning typically makes the affected areas contrast more starkly with the surrounding skin.〔(【引用サイトリンク】title=What to Avoid While Treating Tinea Versicolor )〕 * Sharp border 〔http://www.dermnetnz.org/fungal/pityriasis-versicolor.html〕 Pityriasis versicolor is more common in hot, humid climates or in those who sweat heavily, so it may recur each summer.〔 The yeasts can often be seen under the microscope within the lesions and typically have a so-called "spaghetti and meatball appearance"〔(【引用サイトリンク】title=Adolescent Health Curriculum - Medical Problems - Dermatology - Papulosquamous Lesions (B4) )〕 as the round yeasts produce filaments. In people with dark skin tones, pigmentary changes such as hypopigmentation (loss of color) are common, while in those with lighter skin color, hyperpigmentation (increase in skin color) is more common. These discolorations have led to the term "sun fungus". 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「tinea versicolor」の詳細全文を読む スポンサード リンク
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