I've noticed these kinds of marks appearing on my ball pythons head, he has had them before but they heal over time, is there any reason for these such as depression or stress maybe? He seems happy enough and is always happy to sit in his viv and watch the world go by or come out and explore but that is just what i feel from how he acts... hope its nothing i am doing wrong! for other pictures email me - dan.fairs.96@gmail.com, Thank you.