is this a stress behavior ?

[lilmaambeardie]

I recently noticed that my beardie’s tail is brown when I take her out it gets very dark at the end then lightens up to about the halfway mark & then is just her normal color. I was concerned it may be tail rot but then noticed that once she was in her tank sleeping it has lighten up almost completely back to normal (still a bit brown) . Could this just be from her being stressed or should I be concerned?

 

[KarrieRee]

Could be anything - sometimes they get dark if going into a shed --- tail rot is brittle at the end dried out looking -- they tend to turn different colors for different things -- its like a mood ring
Karrie