There are several cases of hard bumps on the little finger of the foot. The first one is the plantar wart, commonly known as a wart, is a local viral infection, infected virus is human papilloma virus, plantar warts treatment is mainly liquid nitrogen freezing treatment, liquid nitrogen freezing treatment needs to be carried out several times, generally once is not enough. The second, commonly known as calluses, also called calluses, usually wear hard shoes or high heels, footwear and other shoes uncomfortable, repeated friction caused by the treatment is mainly warm water soak feet, soak feet can be trimmed after their own. If the effect is not good, you can apply topical drugs that exfoliate the keratin, such as vitamin A acid drugs or 20% urea cream. Thirdly, other disease-related rashes, such as knuckle pads or other rashes. It is recommended to visit the local hospital for a face-to-face consultation to get a clear diagnosis by the doctor. There is no good treatment for knuckle pads.