Lumps in the scrotum are really common. There is often a worry that this may be testis cancer but often the lump is from the epididymis which is a structure attached to the testis. Sometimes the lump is actually a swelling around the testis called a hydrocele. It is important to be sure of the cause and we will conduct a careful clinical examination and probably arrange an ultrasound examination. If the swelling is due to testicular cancer we will advise you on the best course of action. Testicular cancer is however usually treated with very high success rates.