Magnesium sulfate wet compresses are mainly used to treat swollen wounds, such as those of a lateral perineal incision or abdominal wounds. Magnesium sulfate is a hypertonic solution that is very effective in reducing swelling by absorbing water from the wound. Contraindications are mainly wound ulceration, if there is wound ulceration is not recommended to use magnesium sulfate wet compress, will lead to excessive absorption of magnesium ions, and sometimes even respiratory depression and other signs of toxicity. Magnesium sulfate dressing for non-infectious wound swelling, if the wound swelling accompanied by symptoms of infection, such as redness, hardness, pus, cracking, etc. should not use magnesium sulfate dressing, to give antibiotic anti-infection treatment. Generally at the same time, the wound should be opened, remove the sutures, and change the medicine regularly, so that it can heal gradually.