A test to discover whether a person is allergic to any of a range of substances which are applied to the skin in light scratches or under a plaster.
- The third kind of skin test is called a patch test.
- During a patch test, your skin may be exposed to 20 to 30 extracts of substances that can cause contact dermatitis.
- Investigators can also perform the patch test to diagnose natural rubber latex allergy.
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