I will fifth that on sounds like shingles. Did he have a shingles shot in the past?

My husband and I had the Pfizer in February and neither of us had reactions on either shot. I had friends and one of my doctors that had the Moderna/Pfizer and experienced extreme sluggishness for a day. At first I worried that the shots did not work for my husband and me, but I got over it. Now I am a happy camper.