Hi there, it just looks like a natural darkening that a lot of beardies have. Has the tip been gone for a long time ? It will probably be fine but keep an rye on it in case it gets infected looking or shriveled. But for now it looks good+ will probably be no problem at all.
Thank you her tip has been off since she was little but that part of her tail never sheds when i took her to the vet for other reasons they said she is healthy and she could have lost the tip when she was housed with others when i bought her. She is very spoiled and i am super paranoid that it will get worse but all in all she is perfectly healthy and happy