Blepharitis - Eyelid Swelling
"Blepharitis is inflammation of the eyelids. It's a common cause of sore, red eyelids and crusty eyelashes. Eyelid inflammation is very common: In a recent survey of American ophthalmologists (eye MDs) and optometrists (ODs), these eye doctors reported that 37 percent and 47 percent of their patients, respectively, have had blepharitis symptoms at some point. This survey also found that younger people reported more (and more frequent) blepharitis symptoms than older people, which contradicts conventional wisdom about eyelid inflammation.
There are several possible causes of blepharitis, including:
Bacterial eyelid infection
Meibomian gland dysfunction
Fungal eyelid infection
Blepharitis and dry eyes often occur at the same time, causing confusion whether dry eye causes blepharitis or blepharitis causes dry eye.
Treatment of blepharitis should begin with a visit with your eye doctor to determine the cause of your eyelid inflammation. Your doctor will examine your eyes and eyelids to evaluate whether you have blepharitis and determine what type of blepharitis treatment is most appropriate.
Source - All About Vision