牛皮癣的病机是

A．风寒之邪郁于肌肤

B．禀赋不耐感受邪毒

C．过食肥甘厚味，肠胃湿热

D．风湿热阻滞肌肤，日久血虚风燥，肌肤失养

E．冲任不调，肝肾不足