it looks tiny, it looks like the wound is just 1mm in diameter and maybe 2mm of the tail is missing. (without units: about the size of half a grain of rice). and it looks like the wound already healed or dried up, i see no red, and no swelling or anything. its not a big deal.
i think nothing needs to be done, and nothing can be done. all you can do is that for the future, after each shed, check the tip of the tail as well as the eyecaps. sometimes you can then catch it in time, and carefully remove stuck shed from the tailtip.