Causes and Risks Blepharitis is usually caused by seborrheic dermatitis , a bacterial infection, or a combination of both. Allergies , or eyelash infestation with lice may less commonly cause blepharitis. Blepharitis is characterized by excess oil production in the glands near the eyelid, which creates a favorable environment for the excess growth of bacteria which are normally present on the skin. 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, and allergies.
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