Symptoms vary in severity from person to person. Most environmental allergens contact the skin or are inhaled. Therefore, most symptoms affect the skin or the breathing passages. Many disorders are associated with, triggered, or worsened by allergies. These include eczema , asthma , and many others.
Allergies are common.
Tests History is important in diagnosing allergies , including whether the symptoms vary according to time of day or the season and possible exposures such as having a pet in the household. Complement levels may be abnormal. Skin testing is the most common method of allergy testing . This may include intradermal, scratch, patch, or other tests. The goal of treatment is reduction of allergy symptoms.