Piérard-Franchimont C, Piérard G E
Service de Dermatopathologie, CHU du Sart Tilman, Liège.
Praxis (Bern 1994). 1997 Jun 4;86(23):979-81.
Hair follows a cycle of growth and involution which is asynchronous among follicles. Three phases are distinguished, namely the anagen growth phase and the catagen and telogen phases of regression. Any kind of alopecia results from perturbations of the hair cycle. Among triggering factors, various hormones, cytokines and apoptosis-inducing agents are currently recognized. Some microorganisms inducing inflammation could modulate the severity of selected hair loss disorders.
毛发遵循生长和退化的周期，而毛囊之间的这个周期是不同步的。可区分出三个阶段，即生长期、退行期和休止期。任何类型的脱发都是由毛发周期紊乱引起的。在触发因素中，目前已认识到多种激素、细胞因子和诱导凋亡的物质。一些引发炎症的微生物可调节某些脱发疾病的严重程度。
