Swollen eyelid is an indication of some type of infection and can be accompanied by a slight discharge from the corner of the eye. Eyelid swelling can be caused as a result of allergies, blocked glands, conjunctivitis, orbital cellulitis, blepharitis, stye, and chalazion. Symptoms of eyelid swelling usually include inflammation, redness, itching, scale formation, etc., in the areas around the eyes and the eyelids. This swelling may be accompanied by severe pain and discomfort. It may also hamper one's ability to see clearly.