Anaphylaxis is a severe allergic reaction that can occur within seconds or minutes of exposure to the allergen. It most commonly affects the skin, mucus membranes, respiratory system, gastrointestinal tract and cardiovascular systems.
An allergist is a doctor who specializes in the prevention, diagnosis and treatment of allergies.
Remember that for the proper selection of health professional that treats anaphylaxis you must consider the nature, severity and symptoms you are presenting.