What you seem to have is Scortal edema. Scrotal swelling is an enlargement of the scrotal sac. The scrotal sac, or scrotum, houses the testicles. Scrotal swelling can occur due to injury or an underlying medical condition. It may be caused by an accumulation of fluid, inflammation, or an abnormal growth within the scrotum. infections, hernia, and tumors. It is a benign buildup of fluid around a testicle that can appear as testicular or scrotal swelling. A variety of diseases or trauma can result in scrotal edema. Localized trauma and disease can affect the penis and scrotum. Systemic illnesses may have scrotal edema as a side effect. Dysfunction of the circulation or management of internal body fluid can result in scrotal edema. Edema can eventually lead to fibrotic changes that require surgical intervention. A PET scan give you deeper insight. I would ask you to seek yet another urological opinion from an experienced doctor. Usually elevation, compression, support and slings are used. adaptions must be made quickly to treat the problem. It is important to treat scrotal edema early before the scrotal tissue becomes fibrotic. Though you report no pain it has to be evaluated