The lump of flesh inside the testicle of an eight-year-old child may be caused by trauma and swelling, testicular cyst or testicular inflammation. 1. Traumatic swelling: when the testicles of an eight-year-old child are injured by direct or indirect violence from outside, it may lead to the soft tissues inside the testicles being damaged and appearing to be swollen, resulting in a lump of flesh inside the testicles. 2. Testicular cysts: benign lesions, soft to the touch, fluctuating sensation, clear boundaries, no shrinkage when squeezed, and a positive transillumination test, which can also be manifested as a lump of flesh inside the testicle. 3. Orchitis: testicular infection of eight-year-old children by bacteria can lead to orchitis. Repeated stimulation of the testicles by inflammation may result in swelling of the testicles, leading to the appearance of the child’s testicles with lumpy flesh symptoms. Eight-year-old child testicles inside the lump of meat may also be other causes, such as epididymitis, epididymal cysts, etc., we recommend that the patient go to the hospital in time, choose the appropriate method to treat the disease.