Hi ! Possibly your ultrasonologist meant that the location of the cyst
is next to the epididymis
of testis. If they have grown, and are causing you discomfort, then you may consult a general surgeon/Urologist
who may clinically examine you before deciding on the course of action - possibly surgery. However, you do not have to worry much, because cyst are usually benign swellings on the testis specially if they are painful/sensitive. But because of the need for exclusion of malignancy, one may have to go for a biopsy
of the cyst. Wishing you an early recovery.