Having a testicle that is bigger than the other is a normal finding, and the mass you are feeling on top of the testicle might be the epididymis.
But, I strongly suggest that you visit your physician to examine you and rule out more serious problems.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.