I have a dandruff problem which does not seem to go away. Which shampoo can I use to control it? For how long will I have to use the shampoo to see results? Answered by Dr Shuba Dharmana a cosmetic dermatologist and hair transplant surgeon Dandruff is a dry flaky irritated scalp condition which is caused by the over growth of yeast called melassezia. This type of fungus lives on the surface of the skin in many but in some it buries in the hair and lives there. The body reacts to it by causing excessive production of cells. The