The causes of skin ulceration and suppuration are more, bedsore, frostbite, herpes zoster, burns and other diseases can cause ulceration and suppuration, the reason is related to the secondary infection, do not control the disease in time and other conditions, need to carry out a specific analysis. 1. Decubitus ulcers: Decubitus ulcers are also known as pressure sores, and skin ulceration and suppuration are mostly due to long-term local skin pressure, poor blood circulation, and lack of timely cleaning and changing of medication, which leads to aggravation of skin tissue decay in the area. 2. Frostbite: the skin will be red, swollen and purple when it first forms, and with the aggravation of the condition, there will be blisters and itching in the area, and when the blisters are scratched, the skin breaks down, and the secondary infection may lead to pus. 3. Herpes zoster: If the blisters in the herpes area rupture, the repeated rubbing of clothing on the body may lead to secondary infection, causing skin ulceration and suppuration. 4. Scald: Scald patients due to local skin loss, easy to secondary infection, once infected with Streptococcus pyogenes, may be manifested as local skin breakout pus phenomenon. It is recommended that patients go to the hospital in a timely manner, and actively cooperate with the doctor for treatment, so as not to aggravate the symptoms of broken pus.