虽然很多感染都会导致脱发，但是影响头皮和头发最常见的感染是癣。
Although a number of infections can lead to hair loss, the most common infection that affects the scalp and hair is ringworm.
毛孔的阻塞导致脱发——毛孔阻塞阻止头发向内生长，而不是脱发。
Clogged follicles cause hair loss. - Clogged hair follicles lead to ingrown hair, not hair loss.
血液循环贫乏导致脱发——研究人员发现增加血液循环的药物并不能使光秃的头皮长出秀发。
Poor circulation causes hair loss. - Research shows that medications that increase blood flow to the scalp do not grow hair.
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