Eyelid margin disease refers to a common condition in which the eyelids are persitently inflamed. The condition produces dandruff-like flakes and debris that collect on the eyelashes and eyelid margins. Patients with eyelid margin disease typically complain of constant itching, stinging, burning and redness.
Blepharitis, or inflammation of the eyelid margin, is one of the most common eyelid problems. Blepharitis is an uncomfortable condition that usually produces inflamed and itchy eyelids, but it doesn't permanently damage eyesight. Blepharitis can begin during childhood and may last throughout life. The best way to treat blepharitis is with good eyelid hygiene, including regularly cleaning the lids and lashes.
Source: American Academy of Ophthalmology, Eyelid Margin Disease, Including Blepharitis. Medem, 2004.

