Not sure what is going on. I would check with the surgeon's office for ideas. I switched to a more natural deodorant once healed, and everything went along fine for ages, then I tried another one- all good, but then, a couple of years later, I started with itchies and rash. We already knew for decades that I was allergic to the propellant deodorants, and then anything with aluminum in it. So, now, apparently, nothing with baking soda is going to work. Hope you find the answer (and some relief) soon. Hugs!