My arm was SORE and HOT after booster and I felt like I had the flu for a couple days, but after the third day post booster I was back to normal.
My arm was SORE, HOT and Red after my first Pfizer shot, my RN wife said that it looked like isolated Shingles. 3 days later my shoulder looked normal, was not hot nor red.
My RN wife and a doctor friend felt that the shingles shots I had received the year before stopped the Shingles.
On of our friends had even a worse reaction around his belt line. They took pictures and sent it to his doctor at their clinic. It was the classic Shingles pattern in/on his belt line.
By the 4th day post shot, his waist line had cleared up. His doctor, also, felt that the Shingles shots given to our friend, the year before, stopped the Shingles. In that doctor made a house call to validate what our friend and his wife were saying about the disappearing shingles.
One can only imagine the fun, this friend and I missed, due to having our Shingles shots before the Pfizer 1st vaccine.