My Husband Has Had Pain Over His Left Eye For

My husband has had pain over his left eye for about 4 days. Yesterday his left eyebrow and left cheek started swelling and then the swelling went to his eyelid. At this time, his left eye is almost swollen shut. A hard lump has formed on his left cheek (up high on his cheek0. About 35 years ago he had an eye injury to his left eye and a torn & detached retina. So he has very little vision in that eye. Thoughts?