Blepharitis is caused by inflammation of the eyelash follicles in the eyelids. This condition is caused by an excess production of the bacteria that are normally found on the eyelids. This excess production is usually caused by an overabundance of oil produced from the glands near the eyelids. Blepharitis can also develop because of the presence of eyelash mites. People with other conditions such as rosacea or seborrheic dermatitis are also more prone to blepharitis.
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