It looks like old shed, but real old. It appears to be starting to constric the end of the tail. You can see the point where it appears to be constricted about 2 inches up from the tip. Keep a close eye on it. I'd try giving her a bath a couple times a day and lightly rub her tail with a soft bristle toothbrush.
There is something wrong with my beardies left eye!! I included a picture where it shows what her right eye looks like then the others are what her left eye is. She always has it closed (as much as she can) and she finally opened it for a bit when i misted her. I don’t know what i could be doing wrong and it’s not from sand because she doesn’t have it in her cage.