<unk> s are fairly common, appearing in about 30% of adult men. They are usually found during self examination or while men are undergoing imaging studies for other conditions.
arise from an accumulation of sperm, usually in the head of the epididymis.
cause is not known
Spermatocele
Scrotal cellulitis
Hematocele
Epididymitis
Hydrocele
Fournier gangrene
Hydrocele 
Varicocele