The callus on the outside of the thumb of the foot is considered to be the possibility of corns, which can be removed through general treatment, medication, physical therapy or surgical treatment. The callus on the outside of the thumb is mainly due to the thumb part of the foot for a long time by extrusion friction caused by local skin thickening, can be accompanied by pain and other clinical symptoms. 1. General treatment: usually pay attention to avoid wearing in tight shoes and socks lead to the foot thumb by extrusion, friction and so on. Avoid picking and digging with hands to avoid local infection. 2. Medication: You can use warm water to soak your feet, so that the corns are fully softened, and then use corns cream or salicylic acid ointment and other local sealing, so that the corns will soften and fall off. It can be used several times continuously until the corns are completely removed. 3. Physical therapy: The corns on the outside of the thumb of the foot can also be removed by physical therapy such as cryotherapy. 4. Surgical treatment: If the patient is due to foot deformity, etc., caused by local long-term friction leads to corns, etc., can be combined with the hand and foot surgery surgery on deformity treatment. For a large area of corns, can also use surgical excision treatment. Foot callus on the outside of the thumb may also be other diseases, it is recommended that patients seek medical attention in a timely manner, after a clear diagnosis under the guidance of a doctor to standardize the treatment, do not self-medication, in order to avoid the occurrence of serious adverse reactions.