There are many variations of normal that can occur, as almost no one is perfectly symmetrical in any area. Some of these variations are normal and are not a cause for alarm, but if there is something that is changing, seems new, or is associated with pain or loss of normal function, you should speak with your doctor
. There are some types of tumors that can begin with swelling in the testicles, and these should be treated appropriately to make sure that you remain healthy and well. Speaking with your doctor is something simple that can be accomplished to help allay your concerns and normalize your finding or set you on the path to wellness. Thank you for your question, and please speak with your doctor.