Epididymal cysts are generally asymptomatic. They occur with increased frequency in male offspring of mothers who used diethylstilbesterol during pregnancy. These are usually not mistaken for other scrotal pathology, and they can be well demonstrated on scrotal ultrasound if the clinical examination is not-revealing. No treatment is normally required.
It is unlikely that the cyst developed during your exercise regimen. If there is pain in areas other than the cyst, you may want to consider alternative diagnoses. This would include an infection or prostatitis. I would suggest a urine test to evaluate for gonorrhea/chlaymdia, as well as a thorough evaluation of the prostate - either via a digital rectal exam or transrectal ultrasound.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.