dermatographism

I've been wondering if anyone else experiences this. If I press my hand let's say on my face too long the area where the pressure was will turn very red. Not itchy or raised but a little hot. This can occur basically anywhere you apply pressure to not only my hands. Also if I scratch my skin the...

A couple of weeks ago, the back of my shoulders started feeling itchy and tight. The itchiness progressed to my neck, chest, face, arms, and legs over the next couple of days. The worst day also included a bad sinus headache and probably the worst heartburn I've ever had. (It was so painful I...