There is a covid rash, but there isn't a lot know about it -
https://www.healthline.com/health/skin-disorders/covid-rash#appearance
You can also get a rash after you've recovered -
https://www.yourcovidrecovery.nhs.uk/managing-the-effects/effects-on-your-body/skin-disorders/
You should call your doctor today. If you are on any meds, it could be an allergic reaction, or something else entirely going on.
Feel better. :)