It looks like it got nipped or pinched -- and the end looks dry --- you need to keep an eye on it -you can soak the tail in some betadine bath solution make it look like tea-- and get some raw unpasteurized honey and put on it w/ a cotton swab or dip it in the honey - something like Manuka honey or from a organic store make sure there are NO crickets in the tank they will go straight for that tail - watch for infection in the tail if it starts to creep up the tail you will need to go to the vet - if the end falls off keep soaking in the honey till it scabs over it will kill the infectionRelatively new beardie, his tail was like this when I got him. Is it tail rot, and if so what can I do to help him?