Hi zach. My simple advice would get this checked out but i know it’s easier said than done but stressing about it is not a good thing to do. I had a big lump come up on the side of my nose 6yrs ago & i went to my doctor about 9 months after it first came up & he told me it was nothing. Finally in february this year i got sick of looking at this thing on my nose so i went back to my doc & asked him to remove it. It was cancer after all!! BCC which stands for basal cell carcinoma but my point is i’m ok & that sat on my nose for 6 long years!!! There are a few things it could be but the fact that it’s not going away does warrant a visit to the doc or better yet a skin cancer clinic as they are more qualified in what to look for. Good luck.
The rash may form a pattern on the back that resembles a Christmas tree. Pityriasis rosea usually goes away without treatment in four to 10 weeks, but it can last months. Medicated lotions may lessen itchiness and speed the disappearance of the rash