Blepharitis is an inflammation of the edges of the eyelids, causing redness and thickening. Scales and crusts or shallow ulcers (areas of erosion) may occur. The disease is common, especially among children, often affects the upper and lower lids of both eyes. There are two types: nonulcerous colitis. The infection of the eyelash follicles and sebaceous glands cause ulcerative blepharitis. Nonulcerous variety, which is more common, can be caused by an allergy or seborrheic dermatitis, which is a scale inflammatory scalp, eyebrows or ears. Head lice can sometimes cause the type nonulcerous.
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