I bought my bearded dragon around two months ago and was seem to not have any problem. About five days ago, it changed its skin to another one. His head was completely normal until 2 days ago, the head is turning completely white and only his head.
Yep, most likely he is getting ready to shed his head. They don't always shed their entire bodies, sometimes they do, but often they will only shed their legs, or one leg, or their tail, or their tail and their head, or just their head, it can be any combination of places. And the way you can tell that they are going to be shedding a certain area or areas is that those areas will usually turn either a very light gray color or a white color first, usually about a week or so before the actual shedding will start. And depending on their natural colors, sometimes a certain area might turn kind of a muted shade of the color it always is, or it can even at times turn a darker shade of the color it always is, usually that's the tail, it will turn a darker shade of it's natural color a week or so before the shed starts (not black, but a darker shade of the color it is). So this is completely normal and you'll see him doing it often.