Um, are you feedng f/t? Because once, i fed one of my boas f/t and it exploded a bit and got on him and then dried an he got flaky.. Try giving your snkes a nice bath and rub his his skin with the water and basically wash him for about 15 min. Then pt him into a fresh and cleaned enclosure that is misted lightly. Leave him alone for a day, and check back up on him later and see if he's still flaky...