What is allergy patch testing? Allergy patch testing screens substances to determine the cause of an allergic skin reaction. Patches with different suspected irritants (allergens) are applied to a ...

Patch testing can determine what's causing your rash If you have a rash called contact dermatitis, your allergist will apply a small amount of possible allergens on patches and tape them to the ...

So, you ate a banana. You've eaten bananas countless times in the past. But this time, your tongue and lips are itching and ...