Methods Assuming the method of open at random and comparison in parallel, using 3% complex benzogl peroxide cream as control group, tazarotene gel as therapeutic group.

• 方法采用随机开放、平行对照法,以他扎罗汀凝胶外用作为治疗组,3%25过氧化苯甲酰霜作为对照组,进行对比疗效观察。