Eyelid edema or swelling is a condition where the eyelids contain excessive fluid. Eyelid edema is most often caused by allergic reactions, for example, allergies to eye makeup, eyedrops or other drugs, or plant allergens such as pollen. Trichinosis, a disease caused by eating undercooked meat, also causes eyelid edema. However, swelling can also be caused by more serious causes, such as infection, and can lead to orbital cellulitis which can threaten vision. Symptoms can include swelling, itching, redness, or pain. Eye swelling should be treated immediately because severely swollen lid can press on the eye and possibly increase the intraocular pressure causing severe complications.

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