Left eyelid hurts when I blink?

The location of pain occurs in the corner and the surrounding area. Doesn't really hurt when I looked around, just only when I blink. I'm sure I have nothing in there, as this seems like a muscle pain, not a 'object in your eye' pain. It happened 2 days ago, very mild, but it just got worse this morning when I woke up. I tried looking this up on the web but found nothing that pinpoints my problem. Also pretty sure it's not a sty or chalazion as I have no swelling or boil on my eyelid. Hope you guys can help, thank you.