It's funny you should say that. When we picked the Beardie up from the pet shop about a month ago he had those marks, and they've never gone away, he eats 2-3 times a day, poops all the time and has just finished shedding.
I don't know what to do to get them to go away. He's in a 4foot viv, Reptisun 10 uv strip light, 100w bulb where he basks, the temps are around 38-40 degrees.