The role of BCG on skin disease is mainly the following aspects: 1, regulate their own immunity, for most immunity-related skin disease treatment has a significant effect, such as due to viral infections caused by skin disease, clinically more common are filiform warts, viral warts, infectious molluscum contagiosum, etc., can be injected BCG, prompting the body’s phagocytes are activated, the activation of phagocytes can improve the body’s 2, the treatment of eczema, allergic diseases and urticaria auxiliary drugs, most of the skin diseases will be long recurring, long anti-allergic or topical creams will lead to drug resistance, and the treatment effect is not much progress, most skin diseases are related to the patient’s own immunity is low, this time the injection of BCG will play a synergistic role. Accelerate the improvement of the disease.