Stress marks?

[Simonthecheeto]

I'm not sure if these are stress marks or if they are just his markings. In the picture below, his lights had just came on so he was just waking up. they always seem much darker when he first wakes up too.

 

[Reptilelady]

Hi , he's just darker to absorb the heat nothing to worry about My beardie looks really dark in the morning too just when the light comes on. Later when its warmer he'll turn lighter to reflect the heat.