This paper introduces Prof. Fang’s experience in treating cutaneous vasculitis related to immunity with special prescriptions. It is argued that disease differentiation and syndrome differentiation should be considered simultaneously, and treats special disease with special prescription. The representative prescription “Xijiao Dihuang Decoction” with the function of clearing heat, dissipating toxin and cooling blood should be used. Patients with insufficiency of blood, external invasion of wind toxin should be treated with “Danggui Syrup” to nourish blood and eliminate wind; patients with damp heat and stagnated toxin should be treated with “Mahuang Lianqiao Chixiaodou Decoction” to clear heat and resolve damp. Three proven cases are presented.