What causes dandruff?

Dandruff is not about your hair or how often you wash it. Instead, it is the skin on your scalp. A very common fungus called malassezia may contribute to dandruff. It resides on the scalp and breaks down scalp oils into substances that could potentially irritate the scalp. In most healthy adults it causes no problems. One theory is that the immune system of a person with dandruff may overreact to that fungus. To know more on this fungus, check this link: https://www.yeastinfectionadvisor.com/malassezia.html