Friday at work my arm started itching. I looked at it and there was what looked like a welt. I was able to stop myself from scratching my arm my punching it with my other hand until it went numb. Since then it has not itched any more. The very center feels slightly raised. There is no pain at this time.
I took a picture here
My thinking is if it doesn’t get smaller by Friday to make an appointment and if it get’s larger to make an appointment.