Welcome to Connect, @patpambern. Having itchy skin seems to be pretty common with Polycythemia Vera. There are a few members in the forum going through the same thing with their PV and share their experiences about how to quell those itches!
Here’s one of the discussions that might be helpful:

PV itching, not after bathing!
https://connect.mayoclinic.org/discussion/pv-itching-not-after-bathing/
How long ago were you diagnosed with PV? Are you on any treatment plan for this such as phlebotomies or taking hydroxyurea?