Nasty red itchy rash- skin mets??

I’ve have a bad rash jumping around from back to one arm and another arm. Leaves one place and goes to another. Now I’ve had it to my upper chest and neck. I don’t think it’s a rash anymore. This is so itchy and red and dry. I’m finding it hard to find info on this. Has anyone had this experience and was it skin mets??

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