I cannot confirm anything without a clinical examination. Based on the description of your symptoms there are a few possibilities. It could be hydrocoele which is a fluid collection in an area around the testicle.Another possibility is of a varicocoele caused due to dilatation of the pamniform plexus. Very rarely it could also be a normal physiological/anatomical variation. But since you have noticed the difference I will advise you to get it checked by a urologist and clarify your doubts. Do write to us again.
Best of luck and regards!
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