Sperling L C
Department of Dermatology, Uniformed Services University, Bethesda, Maryland, USA.
Dermatol Clin. 2001 Oct;19(4):711-26, ix. doi: 10.1016/s0733-8635(05)70310-7.
Hair loss (alopecia) occurs as a manifestation of numerous systemic diseases, but usually can be categorized into one of five general groups: telogen effluvium, anagen arrest, follicular destruction, hair miniaturization, and hair shaft defects. An excess of hair also can be evidence of internal disease, and there are two general categories of increased hair density: hypertrichosis and hirsutism. The basic categories of hair disease and the systemic conditions associated with them are discussed. The history, physical examination, and histopathologic data usually are sufficient to categorize the form of hair disorder and may provide a clue to the nature of the underlying systemic disease.
脱发（秃发）是多种全身性疾病的一种表现，但通常可分为以下五大类之一：休止期脱发、生长期停滞、毛囊破坏、毛发小型化和毛干缺陷。毛发过多也可能是内科疾病的迹象，毛发密度增加一般分为两类：多毛症和高雄激素性多毛症。本文将讨论毛发疾病的基本类别及其相关的全身性疾病。病史、体格检查和组织病理学数据通常足以对毛发疾病的类型进行分类，并可能为潜在全身性疾病的性质提供线索。
