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Is it just 1 side of the scrotum that is swelling?
If the size of your scrotum fluctuates, this could be a couple things. It could either be a hernia or it could be a fluid collection called a hydrocele. You need to get into see a urologist for examination to determine what you have. If it is so severe that it is causing your penis to become hidden, it sounds like you probably need to have surgery to correct either of these problems. Hope this helps.