Subcutaneous hard lumps are painless, itchy and hard, which may be caused by fibroma, lymphoma, sebaceous cysts, syphilis and so on. 1. Dermatofibroma: it can be manifested as round, hard nodules on the skin, commonly found on the extensor side of the limbs, usually not accompanied by pain, itching symptoms. 2. Lymphoma: usually manifested as painless enlargement of lymph nodes, which may not be accompanied by itching. 3. Sebaceous cysts: If the sebaceous gland secretion can not be discharged normally from the mouth of the gland and accumulates under the skin, it can lead to hard lumps under the skin, which may not be accompanied by itching and pain. 4. Syphilis: when the skin is infected by the spirochete syphilis, a chancre may appear, which is characterized by a hard lump under the skin that is painless and itchy. If the chancre is not painful or itchy, it may be caused by other diseases, so you should go to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor, so as not to delay the condition.