What is this??

Kiyanna

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​I keep seeing this on my sons hands. Usually when he gets out his carset or a bath. He doesn’t cry while in the carbor whine taking a bath for the most part. When I touch the marks he doesn’t appear to be in pain. I’m worried about him though. The marks usually go away with a few hours and they are always on the palm of his hands. Conner is almost 5 months old.