#tail rot

Is tail rot I can't tell. Normal tail supposed to be crooked? What is that dark blueish mark seems like a pen mark? Does anyone know?

Hello. Can you guys help me i found my guy Like this and i AM wondering is this tail rot or just shead bc he is scratching himself but i'm my opiniom it looks bad pls help fast

I have a new bearded dragons and I got him with a weird tail and I want to know if it's rotten tail