I am relieved to find all of these posts. I have been experiencing the exact same things and have wondered if it was the Moderna booster. I had my booster on Fri Dec 3rd. Around 10 days later my scalp started to itch and then itching spread throughout my whole body. Each day seemed to be a new spot. My ears were inflamed, I had hives wherever I was itching. I even woke up one morning with hives on my face. After 3 days of trying benadryl and claritin I went to urgent care. I was prescribed Prednisone for 6 days. The doctor at urgent care said i was the 3rd person to come in with similar symptoms after the moderna booster. I have been off of Prednisone for over a week....the crazy itching stopped but I have dermatographism and I am just wondering when this will ever go away. If I itch anywhere on my skin it is bright red. Has anyone on here had their skin fully resolve yet???? and how long did it take?? I have an appt with an allergist but if it really was the booster I'm not sure if it's even worth it. I had no skin reactions with the first two moderna shots last April. I had the usual side effects like headache, fever, chills but no crazy reaction.