Hard bumps on the toes of children may be related to flat warts, corns, tendon cysts and other causes. 1. flat warts: human papilloma virus infection in the toes of children, can cause the toes appear raised skin pimples. 2. corns: children’s toes are subjected to long-term extrusion or friction of the skin, which can lead to localized conical thickening of the skin with pain, manifested as hard bumps. 3. Tendon sheath cysts: increased synovial fluid secretion in the small joints or tendon sheaths of the foot, when the amount of synovial fluid accumulates to a certain extent, a lump can be formed. Parents are advised to take their children to the hospital in time, to clarify the cause of the disease, and to standardize the treatment under the guidance of the doctor, so as not to bring adverse effects to the body due to the delayed condition.