Weird recurring rash

30 female

Gastroparesis EDS and POTS

Taking Ritalin

Hi everyone. I have a weird rash that randomly appears. It starts on my shoulders and then moves to my chest and back. It usually lasts 3 days starting on my shoulders day one then spreading on day two and then slowly going away day 3. Tylenol has been a known trigger but it’s come again with no Tylenol. I can PM a pic but it won’t let me post it here.