What tests are done to diagnose dermatitis?

What tests are done to diagnose dermatitis?

Usually your healthcare provider will be able to diagnose dermatitis based on examining your skin. However, when there is doubt, they may perform the following tests:

• Blood tests to check for causes of the rash that might be unrelated to dermatitis.
• A skin biopsy to distinguish one type of dermatitis from another.
• An allergy skin test.