does anyone have white dermographism?

i showed my GP photos of my facial/chest flushing, and the pretty pictures i can draw on my skin - but i don't get increased redness with hives after the pressure - i get white marks that fade quickly. but they take long enough to fade that i can write a letter or draw a happy face to make my kid laugh. i get this on my arms also.

i know that white dermographism is only discussed in associated with atopic dermatitis - so i wonder if that rules out the MCAS/Masto concern I have been wondering about.

i just did a tryptase test yesterday so i guess we'll know if masto is an issue by next week?

wondered if anyone else has this form of dermagraphism with a diagnosed form of mast cell disease...

I get red and white dermatographism depending on the day,

I'm a ? MCAD

more about my story here if you need:

http://mastcelladrenalinsufficiencypots.blogspot.com/