Dandruff is the massive shedding of cells from the corneal layer in the scalp. Although it is normal for skin cells to die and form flakes, some people, chronically, experience an abnormal amount of these, which is usually accompanied by redness, irritation and itching.
Greasy dandruff can be caused by overactive sebaceous glands. Other factors may be family history, food allergies, the use of alkaline soaps, mycosis or stress. Even the season of the year can contribute to the problem, cold and dry winters and even fall are notorious for bringing dandruff or making it worse. Dandruff symptoms can also be aggravated by exposure to dust, ultraviolet light, too strong shampoos, and hair dyes. In some exceptional cases, dandruff can be caused by excessive use of gel or fixative spray.