17 yo with facial swelling for 9 days, complaints of headache, nasal congestion with mild elevation of liver enzymes (ALT, AST 118, 117), neg CT of head and sinuses, no improvement with steroids, no new exposures, CRP 1.6, leukocyte est positive in urine, otherwise normal. Teen has had no new exposures, no new cosmetics, no travel history, no uncooked pork eaten. Is currently on Keflex and Ultram. Your thoughts with respect to diagnosis? Hepatitis panel negative. Another virus? hereditary angioedema, autoimmunity?