I’m no expert or medical professional, but I get a similar type red rash occasionally. I’ve been told it’s either dermatitis or anxiety. I never know if it’s an allergy or my anxiety, since I do have a lot of it. I’ve been in treatment for anxiety since last year, and it’s better, but I still get it at times. Mine really itches a lot, so I get scratches on my skin. Avoiding stress helps me as well as using Cera Ve Body Cream, psoriasis strength. I also have psoriasis, but it looks different from my red rash. The psoriasis is mainly on my scalp and is intermittent. I use clobetasol for the psoriasis.
https://www.medicalnewstoday.com/articles/317631
Did you show the photos to a dermatologist?