The terminal hair shaft is made up of three layers: cuticle, cortex and medulla. 毛干也由三层结构组成,依次为毛小皮,皮质和髓质。
Hirsutism often occur later, it refers to the excessive growth of terminal hair in women, with distribution and growth characteristics like men. 雄激素性多毛症指女性终毛过多,且呈男性型分布和生长特征,常比痤疮更晚出现。