Dear sir,
Thank you for your query at DoctorSpring.com
From your description you seem to be having epididymal cyst.
Epididymal cyst is an outpouching within the epididymis and is collection of seminal fluid. The cyst is non cancerous and needs no treatment.
I shall like you to be examined or subjected to ultrasound to confirm my diagnosis.
Take care
Sincerely
Rajiv Goel