我之前也是后背大面积长痘，首先要找到长痘的原因，我是因为湿气太重！我找了中医开了去湿气的中药，偶尔也喝红豆薏米茶，此外，用硫磺药皂洗后背，一星期两三次，不能每天洗，勤换衣服，床单随时保持干净，多晒被子和贴身衣物

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