Rash after total knee replacement...anyone else?

I am about 2.5 months out from Total Knee Replacement. I have been off pain meds for a while and I am not on any new medications, soaps or detergents.

I noticed a few "pimple" fluid filled like places on the surgical knee. They were not
not on the incision about the 3rd week out. They would itch and then go away. Never more than 3-5 at a time. They are pretty much gone at this point on the operated knee.

I then started with more of these but more rash like on my shoulders, hands and I have had a few on my face. I use Benadryl Cream and Zyrtec and it calms them down and they go away in a few days and then new ones start.

I have an appt with the surgeon in a few days.

The Dermatologist didn't know what they were and gave me a sample of a body wash to see if it would help clear them up. It didn't.

Anyone else have this after knee replacement?

Blessings & Prayers to all you TKR Folks!