Strange coloration

[seanUTD]

Im just seeing if anyone has seen their cham do this before... I am aware that they change dark as they soak up heat but I have not seen a cham change everything BUT their head and my Herbie did this today?

Heres the pic

 

[Carlton]

Im just seeing if anyone has seen their cham do this before... I am aware that they change dark as they soak up heat but I have not seen a cham change everything BUT their head and my Herbie did this today?

Heres the pic

Can't really tell much from the pic. A few reasons chams turn odd colors include:

Starting a shed
A bruise or a burn
Extreme trauma/shock
Close to death when they lose control of their nervous system and large odd blotches of light or dark color show

Don't think these really explain yours unless he's going to shed.