Is it worth a trip to the doctor for scrotal swelling?

See a specialist: Yes. There are few benign problems related to scrotal swelling, the problems can range from "simple" skin infections (which can easily lead to a fasciitis) to a pathological process within the scrotum itself (testicular torsion, epididymitis, varicocele, sprematocele, etc). An examination by a urologist is definitely called for.

Depends: On your own specific goals and values. For me - absolutely.

Yes: It may be something benign like hydrocele or hernia, or bad like infection, cancer or torsion. Is the cost of an er visit worth more than your testicles, or those of a loved one?

Peace of mind: Swellings can be associated with pain and tenderness this means testis torsion, epididymitis, cellulitis or an abscess, all require urgent treatment. Torsion pain comes on suddenly and can result in loss of testicle if not corrected within 6 hours. Non-painful swellings should also be seen but are not emergencies, hydroceles, varicoceles, spermatocele cysts, testis tumors which are hard and edema.

Of couse: How else will you know whether the swelling is benign or whether there is an underlying testis tumor causing the swelling! best to get a scrotal ultrasound, i would.