Infection / allergy: Swelling of the upper eyelid could be from an infected oil gland or skin glan, from a blocked oil gland (stye or chalazion), from allergy, from an insect bite or exposure, and from edema related to lying down. Infections are usually painful, tender and diffuse, while a stye is more like a non-tender lump. Allergy usually is associated with itching. Also, blepharitis is a chronic low grade infection.
Answered 4/26/2013
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