Eye strain, swollen lid, black spot on eyelid. What could it be?

Anything! Difficult to diagnose with just a handful of words over the internet. That being said, eyes are critical organs; i would definitely seek immediate medical evaluation.

Related Questions

Girlfriend was in the sun all day and she now has a small black spot on her upper eye lid. She is light skinned with blue eyes and the spot was just n?

Freckle. Chances are this is a freckle or light mole that became darker as the sun rays activated the melanocytes. There are many other possibilities, but would have to know more. Read more...