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1.Mild alteration in size can be felt but if noticeable then there is some pathology going on.
2.As your treating doctor suspect inflammatory changes and giving treatment - thats most possible cause, with swollen testis with obvious symptoms.
3.To confirm the diagnosis the next step should be
ultrasound scrotum. That would be helpful.
4.Ultrasound will evaluate the swelling weather tests or fluid around, vascularity can be checked,
epididymis status and chord thickness and vascular pathologies can be assessed.
5.So next time when you visit the doctor request for scan, that will cheat all your doubts. Good luck.
Hope i have answered your query.
Any thing to ask do not hesitate
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888 Thank you.