Hard lumps on legs may be related to fibroma, subcutaneous hematoma, sebaceous cysts and other reasons. 1. Fibroma: it can occur everywhere in the body, preferably in the proximal part of the upper and lower limbs and the abdomen, and the patients mostly find hard lumps with unclear boundaries by chance. 2. Subcutaneous hematoma: If the legs are injured by bumps and bruises, it can cause the blood vessels under the skin to rupture, resulting in subcutaneous hematoma, which is manifested as hard lumps on the legs. 3. Sebaceous cysts: If the sebaceous gland secretions in the legs cannot be normally discharged from the glands, cysts can be formed, which are manifested as hard lumps on the legs. Hard lumps on the legs may also be bone tumors and other reasons, it is recommended that those who have hard lumps on the legs that do not subside for a long time go to the hospital in a timely manner, to clarify the cause of the disease, and standardize the treatment under the guidance of the doctor, so as to avoid delays in the condition.