I think i may have a varicose vein on my testicle. how do i tell?

By examination: It is called vericocele, usually harmless, if there is fertility problem surgery may be needed.

Bag of worms: If it feels like a bag of worms, it is probably a varicocele as dr. Rao said. Almost always on the left side, they are usually not a problem unless you have pain or there are infertility concerns. It is worth having your doctor check it out if you have concerns.

Varicose vein: Would recommend evaluation by a urologist