Welcome to HCM,
The common causes of pain in testicular area are trauma, testicular torsion
and torsion of testicular appendages.
As your epididymis
of left side is enlarged and you are feeling dull pain in left scrotum
, you might be suffering with Epididymitis on left side.
For diagnosis, examination is required. You should consult a general Surgeon
, so that he can palpate your left testicular area to find out abnormal and tender parts in your left scrotum, and can prescribe accordingly.
Thanks for trusting Healthcaremagic and posting your query.
Hope you found my response to your query informative and helpful.
With good wishes,
Dr.Chandra Shekhar Sharma