Its normal genetically in some cases that right testicle size differs by margin then left testicle.But if pain persists then you need to see urologist as reasons could be many from infection to water retention to hernia or might be normal as well so you need to show an urologist.
As for size don't worry as long as you have normal erections and ejaculation.
Answered2016-03-05 05:54:09
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