It doesn’t look like the pics of herpes or syphillis that I’ve seen online!
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Can someone please tell me what this rash is
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Welcome to A2A, Goforapunch. There is no picture, so it is hard for us to say anything. I presume the rash is in the genital region? There are lots of possibilities: https://www.healthline.com/health/rash-on-genitals
Pictures here may be helpful: https://www.verywellhealth.com/std-symptoms-gallery-std-pictures-4020290
Or here (if you are female, change the setting): https://www.skinsight.com/search-results?age=adult&sex=male&location=genitalia
Not all these rashes are necessarily sexually transmitted. Many can be transmitted by either sex or other ways.