The common causes of a hard bag growing bigger and bigger on the sole of the foot include callus, corns, common warts, etc. According to the specific cause of the disease, you can choose physical therapy, medication, surgical treatment, etc., for treatment. 1.Callus:The occurrence of callus is related to factors such as long-term pressure on the skin, occupation, and one’s own physique, and manifests itself as a flat or slightly elevated keratinous plaque. Treatment, can be used externally salicylic acid, urea ointment, etc., dissolving keratin treatment; can also be frozen through liquid nitrogen and other physical therapy, so that the thickening of the lesion parts of the stratum corneum and the surrounding skin frostbite, necrosis and shedding; if necessary, take surgical treatment. 2. Corns: corns are mainly caused by long-term pressure and friction, induced by the excessive proliferation of the stratum corneum, manifested in the soles of the feet with cone-shaped keratin embolism and other symptoms. The treatment can be external salicylic acid ointment, salicylic acid phenol ointment, etc., corrosion of the skin lesions, so that they fall off; for the lesions shallow and small corns, can be taken to liquid nitrogen freezing, laser and other physical therapy; if necessary, but also can be taken to surgical excision treatment. 4. common warts: this disease is mainly caused by human papilloma virus infection, manifested as a needle cap size to pea-sized pimples. The actual fact is that it’s not a good idea to use the same kind of treatment as you would in the event that you’re not a good sport, but it’s a good idea to use the same kind of treatment as you would in the event that you’re not a good sport, and it’s not a good idea to use the same kind of treatment as you would in the event that you’re not a good sport. It is recommended that the patient go to a regular hospital, clear the cause of the disease, for treatment. Pay attention to follow the doctor’s instructions to use drugs, not blindly self-medication.