Dandruff and Seborrheic Dermatitis (SD) differ in terms of severity and location but are essentially part of the same disease. Dandruff is a minor condition which only affects the scalp; SD is slightly more severe and not only affects the scalp, but other parts of the body too. They occur when there is an inflammation of yeast overgrowth (malassezia) and the body responds with scalp itching and flaking.4