Here is what I found doing a general search. Sounds like it might be your problem.
7) Ear Mites
Ear mites are quite common in kids if the adults are infected. When they scratch their ears and shake their heads at an early age, they should be examined and treated with a miticide. The infected ears often show a scaly, grayish material in the ear canal. The mites can be seen easily when the material is examined with a magnifying glass on a piece of black cloth.
Good luck!