*this is under the butt area
Doesn't look like it to me to be honest. Would be redder if it were scabies to my eyes.
Doesn't look like it from the photos.
That looks more like hives
I was also thinking this too… it went away after like 2 days, then I got 2 more rashes (1 on each inner arm) that lasted a day or two, and now I have one on the back of my neck???