A pimple on the inside of the little toe may be caused by callus, corns and plantar warts. 1. callus: the cause of the formation of callus and extrusion, friction and other mechanical stimulation of the skin, usually manifested as skin roughness, thickening and hard bulges and other symptoms, mostly in the hands and feet and other places. 2. Chicken eye: more and keratin layer over the hyperplasia related, such as friction, pressure and other mechanical stimulation, the patient’s skin will appear bulging, flat keratin hyperplasia, shaped like soybean, most commonly seen in the feet. 3. metatarsal warts: the etiology is mostly due to human papilloma virus infection, metatarsal warts mostly occur in the foot, manifested in the angle of the over chemical, rough plaque, with the growth of time can be developed to the size of soybean. The reason for the bumps on the inside of the little toes is quite a lot, and it is recommended that the patient go to the doctor for examination, to clarify the cause of the disease.