Dandruff is a common chronic scalp condition marked by flaking of the skin on your scalp.dandruff of skin is not contagious and but is seriousa as it is  embarrassing and  sometimes difficult to treat. The best part is that dandruff can be  can be controlled. mild cases of dandruff may need just shampooing and simple and  gentle cleansers. causes  dandruff can have several causes including : Dry skin  is the most common  cause  of  dandruff. flakes from dry skin are generally smaller and less oily than those from other causes of dandruff and will likely have symptoms and  signs of dry skin on other parts of the body such as your legs and arm irritated oily skin ( seboric dermatitis )   main causes of dandruff is marked  by red greassy skin covered with flaky white yellow scales. seborrheic dermatitis may affect your scalp and other areas not h rich in oil glad such as your eyesbrows the sides of your nose and the bcks of your ears ayour breastbone your groin area and sometimes your ar