Blepharitis is usually caused by seborrheic dermatitis or a bacterial infection and sometimes it is a combination of both. Allergies and eyelash infestation with lice may also cause blepharitis, although these causes are less common. This condition is characterized by excess oil production in the glands near the eyelid, which creates a favorable environment for the excess growth of bacteria that are normally present on the skin. The eyelids appear red and irritated, with scales that cling to the base of the eyelashes. Blepharitis may be associated with repeated styes and chalazia. Risk factors are seborrheic dermatitis of the face or scalp, rosacea, lice, and allergies.
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