Entropion is the inward folding of the eyelid, causing it to sit incorrectly against the eye. It leads to many of the eyelashes rubbing against the eye surface. The condition can arise from various causes including congenital deformities, lid scarring, infections, inflammation, and aging changes. Ectropion is the outward turning of the eyelid. It leaves the inner eyelid surface exposed and prone to irritation. It usually affects only the lower eyelid and is more common in older adults. Ectropion is associated with muscle weakness, facial paralysis, eyelid growths, genetic disorders, scars or previous surgeries. Your doctor can identify the cause of entropion or ectropion and determine the most effective treatment.