What causes dandruff?  It’s a question that many sufferers are desperate to find the answer to. For people who aren’t afflicted, dandruff can seem like no big deal. But for those who do, especially the ones with more severe dandruff, the problem can range from mild and annoying to chronic and extremely embarrassing. The itchy, irritated scalp and telltale flakes of skin that are the hallmarks of dandruff can have…