Hi @jackographia! I found your post because I searched to find out what the heck this thing my skin has been doing since my Moderna booster is. After some googling, here I am. No esophageal tightness, no bowel issues, and I can not help you with support groups either, but I do want to share my experience here in the event it helps others. So! I got my booster on Nov 5 2021 at a Walgreens. For the first time, I had side effects that I had not experienced before - a lot of joint pain and fatigue. Mind, I had barely any reaction to my first two doses of Moderna in January and February 2021. After the joint pain cleared up, the dermatographism began. I traveled to Tucson AZ one week later where I had the worst case of nasal allergies caused by pollen that I've had since I was a teenager. Two days after I returned to my home state, I got my hair dyed - same product, same technique, same stylist. This time, my scalp and the surrounding skin was moderately inflamed which had never happened before. All of these things have cleared up but the dermographism continues 24 days after receiving my booster.