患者,男,40岁。因双颧部褐色斑块3月就诊。患者于3月前发现双颧部出现褐色斑块,在外院诊断为黄褐斑,但治疗无效。患者于1年前有明确染发史,无其他漂白性化妆品或药物治疗史,无尿液变色及系统性疾病病史。组织病理学检查示真皮局灶性胶原肿胀,呈黄褐色。诊断为染发剂所致外源性褐黄病。 Patient, male, 40 years old. Due to double zygomatic brown patches March treatment. The patient had a brown plaque in his double-zygomatic masthead before March and was diagnosed with melasma outside the hospital, but the treatment was ineffective. Patients had a clear history of hair color 1 year ago, no other bleach cosmetic or drug treatment history, no urine discoloration and a history of systemic disease. Histopathology showed focal dermal collagen swelling, was brown. Diagnosis of hair dye-induced exogenous brown yellow disease.