Some skin disease or parasite? Mites? No idea! The only reptile I feel somewhat comfy about giving care advise is a RF tortoise. Someone with broader reptile experience will be by to help you soon I'm sure.
It doesn't look like that beardie has finished shedding around its head at all. Unless you have a different picture.
But I would agree with Pearly & say that your beardie' still shedding.
Give it a good soak, that might help get the skin to come off.
I see what you mean in one or two spots, but again, the coloring looks way too light to me for that to be your beardeds natural color, especially looking at the neck coloration.
Do you have any other pics?