How do you know if you have sensitive skin?

An allergist or immunologist is the most qualified to determine if you itchy skin reaction is indeed a skin allergy. An allergist will do skin testing to determine what exactly you may be allergic to. There are 2 types of skin tests. Both tests take about 5 to 10 minutes to perform to determine what your Allergies are. It is recommended that you abstain from antihistamines for 3 to 7 days before the test.