The hard nodules that grow after electrocautery of warts may be localized edema, localized hyperplasia, keloid, etc. They need to be dealt with according to the cause of the disease through life conditioning, medication, and other treatments. 1. Local edema: due to the local skin stimulation caused by electrocautery treatment, it may lead to edema in the surrounding skin tissues, which will gradually subside with the passage of time. In the near future, it is necessary to pay attention to hygiene, to avoid the area of broken skin infection. 2. Localized hyperplasia: As the wound will be left after treatment, if hyperplasia occurs in the wound area, it may form a hard knot. It can be treated by applying local medication such as Mucopolysaccharide Polysulfate Cream. Serious cases should also be handled by methods such as laser treatment. 3. Keloid: The patient belongs to the keloid constitution, which may lead to keloid hyperplasia after the treatment, forming keloid with purplish-red color. In this case, the keloid needs to be removed through cosmetic surgery. It is recommended that the patient consult a doctor in a timely manner to clarify the cause of the keloid, and strictly follow the doctor’s instructions for treatment, do not self-medication.