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Well, first it would help to know what might have caused this.

Were you exposed to windblown dirt or sand?

Are you allergic to pet dander and exposed to an animal you're allergic to?

Do you sleep on a feather/down-filled pillow?

Did you change your laundry detergent?

When was the last time you replaced your mascara or eyeliner?

Do you wear contacts?

Have you been exposed to anyone who has pink eye?

Were you rubbing your eye more than usual?

Can you think of any other possible injury to your eye?