I don't know what exactly this is, but it is not normal - this is not shedding or such. And to me it also looks too severe to be just treated by change in diet or light or such.
With that I would make a vet appointment as soon as possible. Do you have a reptile vet? Otherwise, we can help you find one, there is a database for that.
However, in addition, the condition might be caused or made more severe by diet and/or the light conditions. Despite improving them would not heal that, I think it would make sense to look though them too. Which kind of lights are you use?