If left untreated, common warts can be harmful to the body, such as localized infection, contagious and cancerous. If you don’t treat your warts, you may feel a foreign body sensation, and you may scratch or rub them, which can lead to localized infections, which may affect the aesthetics, and in severe cases, may even become cancerous. The common warts are contagious, and if left untreated may spread to other normal parts of the body, or even to others. If the common warts increase rapidly in a short time, the local redness, swelling, pain, ulceration, etc., it may be a cancerous condition. The clinical use of carbon dioxide laser, liquid nitrogen freezing or intradermal injection of pingyangmycin to treat common warts, the specific treatment method varies from person to person. It is recommended that the patient go to the hospital in time, under the guidance of the doctor to choose the appropriate treatment method active treatment.