Metformin, also called cimetidine, is generally used to treat skin conditions such as burns, hives, acne, shingles and other herpes virus infections. Metformin is an H2 receptor antagonist and is mainly used in the treatment of peptic ulcers, peptic ulcers complicated by bleeding and other diseases. However, the drug is also used clinically for allergic immune disorders, such as chronic urticaria, herpes zoster, acne and other diseases, so it can be used for skin diseases. In addition, Metformin can cause adverse reactions such as nausea, constipation, dry mouth, etc. It is forbidden to use it for people who are allergic to Metformin, pregnant women and breastfeeding women. Note that the drug should not be stopped suddenly, as it may cause perforation of peptic ulcers. Metformin needs to be used under the supervision of a doctor and should not be taken on its own.