The idea behind biological acne scarring treatment is that old, damaged tissues and scars are replaced by new cells.

生物学中痤疮疤痕的治疗方法是用新细胞代替旧的受损组织及疤痕。

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Depending on its severity, acne can cause emotional distress and lead to scarring of the skin.

根据严重程度，痤疮可造成痛苦情绪并导致皮肤疮疤。

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They can be quite painful and scarring is common in this type of acne.

他们可以相当痛苦和瘢痕是常见的这种类型的痤疮。

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Severe acne tends also to involve inflammation, which can lead to scarring and painful pustules.

WSJ: As More Adults Get Acne, New Photodynmic Treatments Use Light