Testicular ultrasound
Urinalysis and urine culture
May also consider GC, Chlamydia cultures
Combination of clinical features and results of imaging/UA
Ultrasound may show inflammation, epididymitis, and rules out active torsion
Urinalysis positive for infection in epididymo-orchitis
Orchitis
Scrotal cellulitis
Dacryocystitis
Epididymitis
Fournier gangrene
Vulvovaginitis
Hematocele
Uvulitis