I have a swollen eye-lid :( ?

A swollen eyelid is not a reason for skipping school. You may have rubbed your eye too hard without realizing it. You may have had some dust in the eye. You may have some make-up in your eye. You may have an allergy but this is very unlikely to happen with just one eye affected. You can get some eyedrops from the pharmacy. If the swelling persists please see a doctor.