A mass inside the scrotum. If a varicocele is large ample, a mass like a "bag of worms" can be visible previously mentioned the testicle. A more compact varicocele can be as well smaller to see but obvious by touch. A varicocele could result in bad development of a testicle, https://www.sgvascularctr.com/what-are-veins-and-why-should-i-know-about-them/