The flakes, which come away when the hair is brushed or combed, represent an increase in the normal loss of the outermost skin layer. Some type of dandruff are accompanied by inflammation of the scalp to give a type of seborrheic dermatitis. Dandruff is usually the result of overproduction by oil glands, in contrast to the common belief that it is caused by dryness. It is also suggested that more severe dandruff associated with seborrheic dermatitis is caused by a yeast-like organism that is common to the scalp. This organism called Pityrosporum ovale is present in low numbers on the healthy scalp, but causes a problem when an overabundance occurs.
Dandruff is a seasonal disorder being most severe in the winter months.
Excessively uses of hairsprays or gels. Improper use of hair-coloring products or excessive use of electric hair curlers. Cold weather and dry indoor heating. Tight fitting hats or scarves. Infrequent shampooing of the hair or inadequate rinsing.