Dandruff is caused by:
- Dry skin – this is the kind you get during the winter when the air is dry
- Irritated, oily skin – sometimes called seborrheic dermatitis
- Sensitivity to a scalp fungus (called Malassezia) can irritate the scalp
- Not shampooing enough – your scalp skin cells die and shed, they can get trapped in oily clumps
- Reaction to certain hair products
Source: Read Full Article