There is a small hard lump in the testicle may be related to folliculitis, tuberculosis, cysts and other causes. 1. Folliculitis: if the folliculitis is caused by bacterial infection, due to the stimulation of inflammation, the lesions of testicles can be manifested as yellow pustules on erythematous spots, and some patients may have small hard bumps and abscesses on testicles. 2. Tuberculosis: caused by tuberculosis mycobacteria invading the epididymis, which can be manifested as slowly increasing hard nodules in the epididymis, i.e. small hard lumps. The hard lumps are bead-like, and the patients are often accompanied by low-grade fever, night sweats and fatigue. 3. Cysts: Due to infection, trauma and other factors, the ducts are blocked, so that the fluid gathers in the testicles, forming cystic lesions, which are manifested as small hard lumps under the skin of testicles, which may be accompanied by pressure and pain and swelling sensation. It usually needs to be treated by cystectomy. In addition, a small hard lump on the testicle can also be seen in other cases, it is recommended that patients go to the hospital in time to avoid delay.