Well, I think it's lupus Erythematosus because It appears on the face in a pattern that looks like a butterfly.
The correct answer is systemic lupus erythematosus and one of it's symtoms is Skin rash -- a "butterfly" rash over the cheeks and bridge of the nose affects about half of those with SLE. The rash gets worse when in sunlight. The rash may also be widespread.