Suggest Treatment For Lump On The Testicle

I found a small seed like lump on the testicle itself, I saw the doctor, and he said it was a cyst, and if I wanted to go to an ultrasound I could. He didn't seem to worked up about it, nor seemed like it was too urgent, so I didn't go to the ultrasound (As they have dissapointed me in the past.) It doesn't seem to have grown, my girlfriend actually thinks it might be shriking. Any idea what I should do? Also, theres another one literally right beside it, slightly smaller, but the same shape. Both noticed at the same time.