👉 A callus, also known as a callous or keratotic skin lesion, is a type of skin病变，which are typically caused by excessive contact with hot surfaces or by prolonged exposure to certain chemicals. These lesions can be either benign (non-cancerous) or malignant (cancerous). They usually appear on the soles and sole surface of feet, but they can also occur on the palms, backs, elbows, knees, and even the face. The cause of call
