<unk>  is one of the most common ocular conditions characterized by inflammation, scaling, reddening, and crusting of the eyelid. This condition may also cause swelling, burning, itching, or a grainy sensation when introducing foreign objects or substances to the eye. Although<unk>  by itself is not sight-threatening, it can lead to permanent alterations of the eyelid margin. The primary cause is bacteria and inflammation from congested meibomian oil glands at the base of each eyelash. Other conditions may give rise to<unk> , whether they be infectious or noninfectious, including, but not limited to, bacterial infections or allergies. Different variations of<unk>  can be classified as seborrheic, staphylococcal, mixed, posterior or meibomitis, or parasitic. In a survey of US ophthalmologists and optometrists, 37% to 47% of patients seen by those surveyed had signs of<unk> , which can affect all ages and ethnic groups. One single-center study of 90 patients with chronic<unk>  found that the average age of patients was 50 years old.
Blepharitis
Periorbital cellulitis
Capillaritis
Ocular larva migrans
Orbital cellulitis
Sympathetic ophthalmia
Periorbital dermatitis
Corneal ulcer