I was wondering if anyone could tell me what this rash might be?

I think it started out as a scratch although even at the time I couldn't think of any way I could've scratched my arm but after a couple of weeks it turned into this rash. It's kinda itchy although I have refrained from scratching it.

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Hello Robert,  have a look at the images on this site, you might spot your rash, or something similar, good luck.

https://www.dermnetnz.org