Plantar warts and corns can be caused by the plantar warts on the soles of the feet. 1. metatarsal warts: the cause of metatarsal warts is related to human papilloma virus infection, trauma, friction and other factors may also be triggered. The plantar warts can be found on any part of the soles of the feet, and they will appear as tiny shiny pimples, gradually increasing to the size of a soybean or larger, with a rough surface and clear boundaries. 2. Chicken eye: the cause of chicken eye may be related to long-term mechanical stimulation resulting in keratin layer hyperplasia, such as extrusion, friction and so on. The skin of the affected area of the patient will appear to be bulging and thickening of the skin, and its keratinous hyperplasia is mostly yellow and light yellow, which is good at the middle of the front of the foot and the heel. There is no single reason for the growth of thorns on the soles of the feet, so patients are advised to go to regular hospitals for relevant examinations to clarify the cause of the disease.