A physician, or physicians, specializing in the diagnosis and treatment of allergies: "Allergists deal with medical conditions in which people become sick or the skin is covered with red and itching marks from reactions to something that is eaten, breathed, or touched."

"Allergists are concerned with the diagnoses and treatments of patients who have an abnormally high sensitivity to certain substances; such as, pollens, foods, or microorganisms. Common indications of an allergy may include excessive sneezing, abnormal itching, and extreme skin rashes."