Swollen testicle. What has happened?

Hello possible causes are:- Epididymitis (testicle inflammation) Gangrene (specifically, a type of gangrene called Fournier's gangrene) Henoch-Schonlein purpura (blood vessel inflammation) 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) Urinary tract infection (UTI) Varicocele (enlarged veins in the scrotum) Consult surgeon for further evaluation and treatment.