What Causes Dandruff?
No one is really sure what causes dandruff. It’s probably caused by a fungus. Hair follicles and oil glands make an oil called sebum, which may be a breeding ground for yeast or fungus. This fungus usually lives on your skin, but too much fungus may lead to dandruff. Too much sebum also may cause dandruff. Not drinking enough water or being exposed to a lot of dry air can cause skin to dry out and flake, which can look like dandruff.
So what can you do about it? Well you can try a special shampoo or you can go the natural route :) WebMD has more, helpful information about that awkward to have problem ^_^