n.粉刺；痤疮
Acne is the most common skin disorder in the United States. 在美国，粉刺是最常见的皮肤病。
Acne is not caused by poor hygiene and it isn't infectious . 粉刺并不因为卫生条件差引起，也不具有传染性。
Many adults also have some acne easily. 成年人也很容易得痤疮。
