Redness, swelling and pain on the soles of the feet: First, the infection of the plantar fascia, which will stimulate the tissue of the soles of the feet with obvious redness, swelling, heat and pain, and after seriousness, it will be accompanied by fever, and there will be an increase in white blood cells in blood tests; second, rheumatism and immune diseases, such as rheumatoid arthritis and gouty arthritis, which will lead to redness, swelling and pain on the soles of the feet after the feet have been eroded, especially when the swelling and pain are significantly aggravated during acute episodes; third, injuries to the plantar tendons and fascia, which will lead to redness, swelling and pain on the soles of the feet in the early stage of the injuries.