yellow color

Question
I looked at those sites and he looks to be a coral and pastel color, but the wierd part is, the yellow is on his bottom leg between the body and the joint, im guessing hes just growing up or is it something else, is it normal for under their leg to change color?

Answer
Hiya Bob,
What you are seeing does sound like normal shed color changes.  I even checked with a good friend who raises bearded dragons to be sure I wasn't missing anything.
When the shed starts to lift, it can look grey to yellow color.  If the scales are normal and dry looking, its normal shed.  If the scales look gummy, wet or abnormal, then its time for a vet check as it can be a fungus or other infection.
With iguanas, they get that same funky yellow tint in their "armpits" and their legs, pre shed look like melted wax...scared the heck outta me the first time I saw it!!  
Hope this helps you out and look forward to any questions you may have.