Skin and blood testing negative for allergies so what would cause the pretty constant burning and itching on my face and in my throat?

Seen by allergist?: Have your consulted a board-certified allergist? Your skin problem may be from a contact allergen which would not be detected by skin or blood test. The throat itching may not be related to the skin problem. Try to keep a record of your food intake and the onset of symptoms for a couple of weeks to see if there is a connection (usually.