If it's not a stye, what could it be?

I’ve had a small bump on my lower eyelid since January or February. It didn’t bother me at first and it’s never hurt. It’s not red or inflamed. Most of the time I haven’t realized it’s there, until recently.

It seems to be slowly growing and now it’s irritating at times. I know it’s there and it’s making my vision slightly blurry.

I’m without insurance until July or August, so I can’t see a doctor until then.

Any ideas? Do I need to rush to a doctor without insurance?