Skin peeling in bottom!? HELP

Caitlin

I was changing my 10 month olds diaper and it's been a little red so I'd been putting a little desitin on it. This time I noticed it looks red and a little like some skin was peeling kind of in the crack of his bottom! We've never had issues with desitin before. We use pampers swaddlers and pampers sensitive wipes. What could this be!? Has me very worried!