I received my Moderna booster shot at a local pharmacy, Friday 1/14/22. I experienced nothing out of the ordinary over the next 2 days such as flu-like symptoms with fever chills, aches, and fatigue, which is what I experienced after my 2nd dose  of the Moderna shot back on 5/7/21.  Monday night, January 24th 2022 around 11:00 pm, about 10 days after my Moderna booster shot, I began to have itching around my neck. It continued on and off throughout the night. The next day at work, Tuesday, 1/25/22, it continued and began to spread up into my scalp along with little bumps around my hairline at the base of my head. As the day went on, when I got home from work that evening it became more aggressive. I could not figure out what the cause could possibly be, as I had not switched to a new laundry detergent, body wash, shampoo, clothes, or anything of that nature. No new foods as a possible reaction. I did not even consider the booster shot as a possibility as it seemed ridiculous to think over 10 days later I could be reacting. However, with nothing else to go on, I looked up reactions to the Moderna booster and found an article with a forum of comments as current as 2 days prior where countless people listed the exact same symptoms I was having and all around 10-14 days after their Moderna booster  .That night it spread to my ears which became red, hot & inflamed. My scalp became hot and itchy as well along with the bumps around the base of my neck at the back around my hairline and spread to my jaw. My eyelids itched and some splotchy red places appeared on my forehead. It spread to my chest, shoulders, armpits, arms, torso, back, hips and my inner thighs just below the groin area. There were raised bumps that looked like large bug bites in places. I could not help but scratch as it was miserable which only made it worse. It was red, itchy and inflamed throughout the entire night so much so that I could not sleep. I was not able to get Benadryl until the next morning and took one Benadryl pill around 9:00 am Wednesday, January 26th, 2022, before I went to work. It knocked out the symptoms of itching and the rash cleared up. However, it only lasted about 90 minutes and the itching came back quickly and aggressively. I could not get in with my family doctor, so I left work and went to Urgent Care 1/26/22, and was seen while the rash was inflamed and active. The doctor, was fortunately already aware of a skin reaction becoming common from the Moderna shot as an immune response even up to 2-3 weeks after receiving the shot. She prescribed a 6 day 10mg of prednisone along with daily Claritin and a Benadryl at night. Within hours of the medication taking affect, I was finally able to get relief. The rash cleared, I was able to sleep and no itching. However, on day 2, I noticed that in between doses it seemed that as the pill started leaving my system, the rash would try to come back in random splotchy red places and itch. A little while after the next pill at lunch that day it went away. However, the night of day 2 it became a little more aggressive with the breakthrough itching before my 2 prednisone pills at bedtime and even tried to start again around my inner thighs. I am on day 3 of the prednisone, 1/28/22, and the same thing seems to be happening with the breakthrough itching and red rash. I am a small petite female. I weigh about 112 pounds, and I?m 5?3?. I have heard that this is more common in petite people and I wonder if maybe going forward with the booster was too much for a person my size. I am also allergic to sulfa antibiotics. I don?t know if any of this correlates, but I do believe that this is definitely my immune system response to my Moderna booster shot. I am concerned this will be an ongoing  problem and am currently waiting to hear back from my doctor to rediscuss the medication dosage for now and future use. I have taken several photos to document this rash since it started and will be glad to provide those if needed.