I am a 17 year old male.
I've had a lymph node in my groin enlarged (about 2 cm in size) since about October of last year, it is now May, so about seven months. I did go to an oncologist for it in January, but after examining it he said it was nothing to worry about (mobile, no night sweats, no weight loss, nothing else) and I was relieved.
It hasn't really grown, but surely hasn't decreased in size either, and still no other symptoms have arisen. However, just yesterday I felt ANOTHER node, just below it, that I'm pretty sure wasn't there before, and it is almost as big as the original one. Still painless, however.
Should I go back to my doctor, even though I've already pestered him about it so much until he finally decided to send me to an oncologist who said it was fine?
Also, I am a runner who trains pretty vigorously as part of the track team. Could heavy exertion, especially with my legs, have caused this?