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A new lump or swelling in the scrotum can make the mind jump to the worst possible explanation. In many cases, the cause is benign and treatable. A varicocele is one common reason, but it is not the only one. Rarely, a lump near the testicle can come from the spermatic cord, the structure that carries blood vessels, nerves, lymphatics and the vas deferens to and from the testis.