Hard small circles on the soles of the feet are considered to be related to diseases such as corns, calluses and plantar warts. 1. Corns: The occurrence of corns is related to bad stimulation and friction, such as wearing shoes that are too big or too small and walking too much. Due to long-term friction stimulation, resulting in the appearance of yellowish, dark yellow limited keratinous growths in the area of the foot force, with pain when pressed or walking with the hand. 2. Callus: repeated excessive mechanical stimulation, friction, pressure, resulting in local hyperkeratosis, can form callus, resulting in local appearance of yellow, hard flaky keratin thickening. 3. metatarsal warts: metatarsal warts are skin diseases caused by human papilloma virus infection of the skin on the soles of the feet. After the incubation period of human papilloma virus infection, the virus proliferates locally, leading to thickening of the skin lesions and pain when pressured. The appearance of hard small circles on the soles of the feet is recommended to draw attention. Timely visit to the hospital dermatology department to understand the cause, but also combined with the doctor’s advice treatment.