Hello, thanks for using health care magic There is a lot of literature on various conditions affecting the body. Though some could be very simplified, most people usually will have the wrong information if not being explained thoroughly. I will prefer you ask your parents to take you to a doctor for adequate examination. You should not do anything like try to pull or compress or any other funny stuff that can rather cause you damage. There is a body part attached behind the testes known as the epididymis which you probably have taken to be the cyst. Only a visit to a medical doctor will give you definite answers to your problem after physical examination. Best regards Dr Achuo