The foot thumb has a hard lump like callus consider is corns, callus, metatarsal warts and so on.
1. corns: long-term friction and pressure can cause local cuticle hyperplasia damage, such as women often wear thin high heels or do not wear socks, bunions and other diseases, these conditions will cause the back of the toes or soles of the foot yellowish or dark yellow cuticle hyperplasia, like the size of a soybean, pressing will have obvious pain.
2. Callus: long-term physical exercise or walking posture will cause local skin keratin layer thickening, appearing wax yellow or yellow local thickening of the plaque, usually no self-awareness of symptoms, serious pain can occur.
3. metatarsal warts: human papillomavirus can be transmitted by direct contact or indirect contact, skin surface damage will induce human papillomavirus infection, resulting in toe skin growths. This kind of proliferation is a yellowish or tawny rough plaque, the border is clear, surrounded by a thickened keratin ring, can appear alone or more than one at the same time.
Hard lumps like calluses on the thumbs of the feet do not exclude other causes, it is recommended to go to the hospital, through the dermoscopy or histopathological examination and other clear diagnosis, standardized treatment under the guidance of the doctor.