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A port-wine stain or ''nevus flammeus'' is almost always a birthmark. It is caused by a vascular anomaly (a capillary malformation in the skin). Port-wine stains ordinarily persist throughout life. The area of skin affected grows in proportion to general growth. Port-wine stains occur most often on the face but can appear anywhere on the body, particularly on the neck and upper trunk.〔 Early stains are usually flat and pink in appearance. As the child matures, the color may deepen to a dark red or purplish color.〔 In adulthood, thickening of the lesion or the development of small lumps may occur.〔 They are called port wine for their reddish color. Port-wine stains may be part of a syndrome such as Sturge–Weber syndrome or Klippel–Trénaunay–Weber syndrome.〔 ==Types== Nevus flammeus may be divided as follows:〔James, William; Berger, Timothy; Elston, Dirk (2005). ''Andrews' Diseases of the Skin: Clinical Dermatology''. (10th ed.). Saunders. Page 582–3. ISBN 0-7216-2921-0.〕 *Nevus flammeus nuchae *Midline nevus flammeus 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「Port-wine stain」の詳細全文を読む スポンサード リンク
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