Dust mite class II is dust mite allergy class II, which is considered mild. Dust mite allergy is an allergic reaction triggered by inhalation, ingestion or contact with dust mite excreta and decomposition products of dust mites when they die, etc. Dust mite allergy is classified into six grades, with the higher the grade indicating the heavier the degree of allergy. The higher the grade, the more severe the allergy. Grade 1 to 2 dust mite allergy is mild allergy, grade 3 to 4 is moderate allergy, and grade 5 to 6 is severe allergy. Grade 2 dust mite allergy is not easy to recur, so dust mite allergy grade 2 usually belongs to the mild degree. When the patient is allergic to dust mites, he should go to the hospital for further examination and treatment under the guidance of professional doctors. If necessary, take antihistamine drugs such as Benadryl under the guidance of doctors. Patients should also pay attention to protection, avoid contact with dust mites, wear a mask when going out, etc., such as the emergence of maladaptation timely to the hospital for medical treatment.