Your symptoms:
Red eyes
A gritty, sandy feeling
Eye is red and/or irritated along the lash line specifically
It might be blepharitis, a chronic condition in which oil glands along the lash line become clogged. Treat it daily for best results. “Warm compresses increase blood flow and loosen the oil to help unclog the glands,” says Payal Patel, MD, who recommends applying a warm washcloth to the eyelid for one to two minutes three or four times a day.