粉刺是由于皮脂和死皮细胞堆积在毛囊中所形成的。
Acne results from the buildup of sebum and dead skin cells in hair follicles.
痤疮发生时，有一个过度分泌的皮脂，这种物质来自毛囊。
Acne occurs when there is an excessive secretion of sebum a substance from the hair follicles.
立毛肌附着于皮脂腺之下的毛囊，当它收缩时，牵拉毛囊直立，产生鸡皮疙瘩。
The arrectores pilorum are attached to the hair follicles below the sebaceous glands and, in contracting, pull the hair follicle upward, producing gooseflesh.
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