I have a 10' burm and unfortunately he had some stuck shed under his chin this past shedding cycle which seemed to make him a bit cranky as well ("yeah, and mommy doesn't feed me enough...I *never* eat enough!"). Anywho, being that a) it wasn't encircling his mouth and no important orifice was being blocked (nostrils, etc.) and b) he was cranky, I gently rubbed a luke warm washcloth on his chin a couple of times and have since let it go. Good humidity and during his next shed, it should all come off fine. =)