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Hello this is Dr. Stan and I will assist you with your question today. I am board certified and I have 40 years of patient experience. I am happy to help you. I'm sorry to hear that you are having this difficulty with your testicles.
Do you have any pain? Did you have an unprotected sexual encounter? Do you have a discharge?
From your description the most likely cause is Hydrocele (fluid in scrotal sac). You should be evaluated by a Urologist. You don't state your age but this may be a sign of testicular cancer.
Do you still have the swelling?