A small lump next to the testicle may be caused by epididymitis, epididymal cyst or epididymal tuberculosis. 1. Epididymitis: Epididymitis is a common inflammation of the male reproductive system caused by bacterial infection, the main symptoms are pain and discomfort in the epididymis, swelling, enlargement, hardening, etc., and the appearance of obvious hard lumps and nodules, which can be clearly found through contact with the testicles, and the symptom of small nodules and small bumps on the testicles. 2. Epididymal cyst: Epididymal cyst is usually caused by the blockage of vas deferens in the epididymis, chronic infection in the epididymis, external stimulation and other factors, resulting in cystic disease in the scrotum, usually the size of the cyst is stable, no conscious symptoms, there are small lumps next to the testicles on palpation, if the volume of the cyst is large, a few patients will experience pain or scrotal swelling. 3. Epididymal tuberculosis: Epididymal tuberculosis is usually caused by the invasion of tuberculosis bacillus into the epididymis, mainly manifested as the epididymis appear slowly increasing hard nodules, and the liquid will flow out after rupture, and patients with a long course of the disease will also be accompanied by night sweats, low-grade fever, malaise and other systemic symptoms. Caused by the testicles next to the growth of small bumps more factors (such as testicular nodules, testicular adenomatoid tumor), so when the patient appears related symptoms, it is recommended to go to the hospital in a timely manner for examination and diagnosis, to clarify the cause of the disease, and then under the guidance of the doctor combined with the personal situation of the targeted treatment, to avoid misunderstanding the condition of the aggravation of the symptoms.