Cham only sheds on his head?

[ChiChamDude]

So I had my veiled cham since he was a few weeks/month old (october), he would shed fine and everything. But here is the weird thing, the last 2 sheds, his head hasn't been shedding and all of a sudden today....his head finally shed.

 

[RandellTheCham]

Could of shed without you seeing? Chameleons usualy Shed when they are growing so maybe his head hasn't Really been growing, Not sure exacly how the shedding process works.