i feel a little lump on my left testicle…i asked for some help from a urologist and he said it's harmless..

If a professional doctor has given you a diagnosis then I would hope that to be trustworthy. If you are still worried maybe you should seek a second opinion?

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I had the same thing; asked my internist about it, he examined it and said that there should be no cause for alarm UNLESS I’ve noticed painful or delayed urination/ejaculation.Did some research myself and find that he’s correct. Sometimes the tubes from the testicle to the seminal vesticle swell, because of intake to the body or crossing your legs too much, or when you’ve been biking often.