hello der Hydrocele (fluid buildup that causes swelling of the scrotum) Idiopathic testicular pain (unknown cause) Inguinal hernia Kidney stones Mumps Orchitis (inflamed testicle) Retractile testicle (a testicle that pulls up inside the groin — this condition occurs in young boys) Scrotal masses Spermatocele (fluid buildup in the testicle) Testicle injury or blow to the testicles Testicular cancer Testicular torsion (twisted testicle) Undescended testicle (also called cryptorchidism) Varicocele (enlarged veins in the scrotum) these things to be ruled out consult surgeon for further evaluation and treatment.