Any ideas what this is? Didn't see it this morning, but could have been there. She was in long sleeves while on walk and playing at the park. I changed her into short sleeves before preschool and noticed this perfect red circle. Looks like dry skin almost, but it's in a perfect circle. Checked her shirt to see if there could have been something to irritate her skin and nothing....Can't see any sting marks or anything....anyone seen something like this before? I'm baffled. Sharing is "large" so you can see it.