I have a itchy red rash on my back that

Patient : I have a itchy red rash on my back that has been there for a couple of weeks- I thought it was healing Wednesday when it scabbed and flaked off, but now it's back to how it used to be. It is a raised red line in the shape of a square (or a squared U shape. It itches and is sandpaper-textured. It began as just a rough patch but then suddenly, about a week ago, turned red and made a line. I have been using apple cider vinegar on it and, like I said, it looked like it had gotten better until a couple of days ago. I've also tried coconut oil and hydrocortisone cream but neither seemed to help. Any idea what it is?
Symptoms:  Rash
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