If there is a lump in the left testicle, an ultrasound examination of the testicle or a detailed physical examination is needed to clarify the possible causes. First, if there has been a history of orchitis and epididymitis, the bumps in the testicle are mostly due to fiber scar nodules, which are formed because the fiber scar tissue is repaired after the inflammation heals, so hard nodules are formed. In the acute stage, there can be obvious pain, and after the inflammation subsides, there can be no painful symptoms, hard texture when touched by hand, tighter adhesion with testicles or epididymis, no pain, no swelling of local tissues, and generally no special treatment is needed. However, if there are recurrent infections or painful episodes from time to time, surgical excision can be considered, but for unmarried men, surgical excision is contraindicated. Second, tuberculosis of the testes and epididymis, when suffering from tuberculosis, the testes and epididymis may become hard nodules, and the vas deferens may become hard and resemble beads or Buddha beads when touched. Patients with a history of tuberculosis infection, such as pulmonary or urinary tuberculosis, need to undergo a tuberculin test and ultrasound examination of the testes and epididymis to confirm the diagnosis.