Entropion is a turning or rolling in the eyelid edge or margin towards the eyeball. This may be noted initially only in the mornings on awakening and then become more constant over time. In this condition the eyelashes and even the eyelid skin can rub on the eyeball causing irritation, pain, redness and even infection. The common cause is a looseness of particular eyelid muscles. Other causes include scarring from surgery, tumors and autoimmune conditions (ocular cicatricial pemphigoid or OCP). Surgical correction, again, depends on the specific cause.