If the bumps are flesh-colored, with obvious bumps and hard nodules in the middle, consider that they may be corns formed by long-term friction and irritation factors, and you can choose to use freezing to remove them. If the hard bumps are keratinized and there are obvious black dots on the surface of the bumps, it is possible that the plantar warts are caused by infection with human papilloma virus, and the black dots are necrotic capillaries. If you wear uncomfortable shoes for a long time rubbing and stimulating, you will also grow similar hard bumps, mainly calluses also called calluses, you can choose to use compound lactic acid cream or salicylic acid cream to apply, can improve improve the symptoms.