However, they do not know what it is! Said maybe we won't ever find out what it is. They was to determine if it's sarcoidosis. There's no real way to determine that other than to eliminate everything else. Sending me to a rheumatologist to check further. Meanwhile I'm on 10 mg of prednisone for a month. Hope that helps this eye. As soon as it's better, I'm stopping of slowly stopping the pred. That's scary stuff.