2 months of right cervical lymphadenopathy, possible lymphoma?

I'm a 24 yo female. About 2 months ago I noticed a swollen lymph node on the right side of my neck, probably in the mid-jugular chain area. It was about 3cm long and 2cm wide, non-tender, pretty firm, and moveable. I had not been feeling sick-- no fever, sore throat, cough, rhinorrhea, etc. A couple days later I noticed another smaller node swell up to about 1cm by 1cm. This one is located behind my ear, on top of the sternocleidomastoid. It is also non-tender, but it feels fixed and non-moveable. I saw a doctor about a couple weeks later. He drew blood and got a chest xray and sent me to an ENT. The tests came back normal (except my platelets were slightly elevated at 450k-- I'm not sure what my baseline is). The ENT doc told me that he wasn't very excited about the nodes since it had only been a couple weeks, and he didn't want to do an FNA. It has been 2 months since the nodes first swelled up, and now my larger node has gone down a bit, but it is still palpable and probably about 2cm long and 1cm wide. It feels much more firm now, but it is still moveable. The smaller node has not changed. I have been relatively symptom free this whole time, although I think I might have some allergies (I tend to need to blow my nose in the morning and sometimes my throat is very mildly sore). I never did figure out why the nodes became enlarged in the first place, and now I'm wondering if they should have gone back down by now? Should I see a doctor again, or keep waiting for them to go back to normal? I've been checking for additional swollen nodes, and in the last couple days I seem to be able to feel some small nodes above my left clavicle (note, the neck nodes are on the right). I might just be imagining things though. Anyway, your thoughts are much appreciated. Thank you.