Dandruff is embarrassing and annoying throughout the year. But, in many, the problem exacerbates in winter because of the dry, cold weather. Dandruff refers to a scalp problem where white flakes are shed by the scalp. This often causes itching. When skin cells die, they shed some flakes. This is normal, but, in some cases, the cells mature earlier than usual and shed dead skin cells in the form of large, white clumps called dandruff. Some of the most common causes of dandruff are growth of fungal infection on the scalp. This can worsen when there is extreme exposure to