An allergist is a physician who specializes in the diagnosis and treatment of asthma and other allergic diseases. The allergist is specially trained to identify the factors that trigger asthma or allergies. Allergists help people treat or prevent their allergy problems.
source: When To See Allergist - American College of Allergy, Asthma, and ...
https://acaai.org/allergies/treatment/when-to-see-allergist