we've had a number of newborn kids in the last month and i've just noticed that 3 of them have hard crusty ear tips. 1 buckling just has it on 1 ear and 2 doelings on both ears. the tips seem sorta' thick & hard with a couple tiny scabs on the inside of the ear but just at the very tip of the ear, not down toward the base of ear. you don't notice it unless you feel the tip of the ear. what could it be?