Entropion is a condition where the eyelid rolls inward towards the eye. It is caused by an imbalance between the muscles and tissues of the eyelid. There are several types of entropion, including involutional (age-related), cicatricial (scarring-related), spastic, and congenital. Symptoms include irritation, pain, foreign body sensation, and tearing. Signs include an inward rolling of the eyelid margin. Treatment depends on the type but may include lubricants, taping, botulinum toxin injections, or various surgical procedures to correct the underlying cause.