Rash all over body/hands

First it started with small bumps on my arm a month ago, then a small blister on my wrist, then three weeks ago I had rashes that looked similar to ringworm spread all over my body. I went to the hospital and urgent care since & nothing I was given has helped. The doctor thought it could be scabies or hand foot and mouth since it’s literally all over my body but none of the medication has helped. No one else in my home has these rashes. It itch really bad and almost nothing is reliving it.