allergic reaction after hair product?

Hello, I tried a new hair product earlier, and when I was blow-drying my hair and looked in the mirror, I saw that my face was red.

I suspect I am allergic to a substance in the product, but only on my face.

My hands and scalp look completely normal.

Does anyone know what could be causing this?

That I only have an allergic reaction on my face, because actually everything that has come into contact with the product should be red🤔

And no, I didn't rub it on my face. I think it all ran over it when I washed it out.

Well, I'm redface now and I'm asking myself this question, maybe someone can answer it for me