Rash guard long sleeve kids Small

Fun long sleeve Crazy Shirt brand spf rash guard. Size is a girls small so like a size 6. We got this as a gift and took on a trip but never used it. So it’s in great shape and not stretched out. There is small mark on the back. 2nd last pic is the shirts back. You can see it on the left side. Then again closer in the last page. I don’t know what this is from since we never used this but probably got a mark from storage/packing. Perhaps you can treat it.