Scrotal masses are something that needs to be looked at right away. Although it could just be a lot of dead sperm that accumulated it could also be something cancerous or a cyst.
It pays to play on the safe side of caution when it involves the groin area and it is nothing to be ashamed about to go see a doctor about.
I would say that I know many problems that involve the scrotum and especially the testicles have a timetable and there is little that can be done after the time limit has been reached. That is why it is good to play on the safe side of caution and make sure that if someone suspects they may have a problem to go see the doctor right away to figure out whether or not they just have an abnormality or something legitimately wrong with them that requires medical assistance.