Horrible rash, help 😩

I have this horrible rash that is so itchy I’ve scratched so much that I’ve bled, I can’t seem to find a dermatologist that will accept my insurance or can see me soon(the earliest was November), I am 1 month PP but I’ve had it since I left the hospital, it wasn’t that bad in the hospital barely noticeable, I though it was just dry skin on my calves, but it has gotten way worse/spread in the past weeks. Should I go to the ER about it or try to find a regular doctor to look at it?