Methods Catechines were used to treat the patients with melasma, and the levels of lipid peroxide (LPO), superoxide dismutaes (SOD),glutathione(GSH), glutathione peroxidation(GSHPx) in periperal blood of patients were measured.

• 方法口服及外用儿茶素，并检测治疗前后患者血中过氧化脂质（LPO）、超氧化物歧化酶（SOD）、还原型谷胱甘肽（GSH）、谷胱甘肽过氧化物酶（GSHPx）。