Is this tail rot?

[Loaf]

I just got this beardie yesterday at a chain pet store, I know bad idea. And I noticed some black on the tail when I got him home. also he doesn’t seem to be eating right. Any help would be great guys, thanks!

 

[Natasha Slatter]

I got two of my little babies from a pet store also. They were left together and chewed on each other's tails. One of them has recently dropped off and the other has healed well so far.
Yours looks the same.

 

[Loaf]

I got two of my little babies from a pet store also. They were left together and chewed on each other's tails. One of them has recently dropped off and the other has healed well so far.
Yours looks the same.

Hm ok did you treat the tails with anything?