Urticaria is an allergic reaction that can come from some medicine or food, manifests itself with intense itching, inflammation and hives.
A dermatologist is a doctor who specializes in diseases of the skin, hair, nails and mucous membranes.
An allergist is a doctor who specializes in the prevention, diagnosis and treatment of allergies.
A doctor or family doctor is responsible for diagnosing and prescribing medical treatments to patients. The family doctor refers to patients where a specialist when a specific treatment is required.
Remember that for the proper selection of health professional that treats urticaria you must consider the nature, severity and symptoms you are presenting.