It's all you can do to resist scratching your head. No, you're not deep in thought - unless it's about how to get rid of the flakes that plague your scalp and fall onto your dark-colored clothing, ever so obvious and embarrassing. But there may be a medical basis for what most people call dandruff. In fact, sebhorrhea dermatitis is the scientific name for dandruff, which is an eczema-like breakout of scaly...