患者，男，26岁。头面皮肤一向油腻,近日头面部出现淡红色斑片，干燥、脱屑、瘙痒难忍，受风后加重，毛发干枯脱落，伴口干口苦，渴欲饮水，大便秘结，舌质红，苔黄，脉细数。根据上述症状，诊断该患者所患的疾病是

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