I was diagnosed with Dermatographia about 7 years ago. It was under control after taking Loratadine daily. I had even stopped taking it and it seemed to be fine. About 4 months ago it started back up and came back with a vengeance. At first I didn’t think it was the dermotographia because it was a little different. After my morning shower my body had redness on my feet, legs, stomach, chest and back. I had an appointment with a dermatologist for a yearly checkup and was seen by the nurse practitioner. I told her what I was experiencing and also mentioned the dermatographia. She recommended taking Allegra in. The morning and Benadryl at night. I’ve been on the regimen and it’s been better but definitely has not relieved the itching . Just recently I began thinking if my dermatographia had returned due to the Covid vaccine. I had 3 Moderna vaccines and my last booster was Pfizer. After reading all these posts, I realize the vaccines are to blame. I will continue with the Allegra and Benadryl but will also talk to my doctor about this and see what she has to say. Will also check out the list of foods that are high in histamine. Unfortunately today my scalp is itching like crazy and I’ve had issues with the redness and lesions on my arm.