[Everglow.]

A short while after my mum had her second jab, she started getting itchy spots on her arms, and after a phone call with her doctor they told her it was quite likely chicken pox, something she'd already had as a child. Her doctor told her that it was likely her body was responding to the new immunity to covid and forgot to respond to other infections as strongly. It might be possible that you've picked up some sort of cold or infection and your immune system was preoccupied.

Either way I'd recommend calling your doctor just to check with them if you're concerned because they will definitely have better advice to give on this, and may be able to tell you if other people have had a similar response.