JIANG Yangqing′s experience in treating eczema was introduced. It is believed that the key of etiology and pathogenesis of eczema lies in dampness and heat. Therefore

clearing heat and draining dampness are the mainstay

and Longdan Xiegan Decoction（龙胆泻肝汤） is the main formula. The focus of treatment is to balance the severity of heat and dampness based on the appearance of skin lesions and symptoms. Regardless of the type of syndrome

weighing dampness and heat and draining dampness the key to treat eczema. Prescriptions should be modified according to the situation of the symptoms.