Prick testing works pretty well right, I mean you can see if your immune system reacts to the different things. Where did you read it was a scam?

Some direct-to-consumer tests are a scam

https://sciencebasedmedicine.org/everlywell-at-home-lab-test...

That really depends. My understanding is that ones where they take some of your blood to do a sensitivity test aren’t real science, but the ones where they prick your skin with a bunch of allergens are. I’ve had the latter done by a real doctor in a real hospital and had real medical treatment done as a result of it.

I've been for skin prick allergy testing.

It accurately identified an allergy I knew I had.