What is this?!

[QuesoTheBeardie]

So I was checking on queso this morning and I saw that the tips of some of the scales on his tail are black! What is this? Please help soon. (Look at the tips)

 

[KarrieRee]

So I was checking on queso this morning and I saw that the tips of some of the scales on his tail are black! What is this? Please help soon. (Look at the tips)

All I see is shed

 

[xp29]

I don't see anything concerning either. (I do see the tips but most beardies have that to some degree)