Dandruff is a common chronic or recurrent eczematous condition affecting mainly scalp, in dermatology, it is called seborrheic dermatitis. It can affect scalp and face and when confined to scalp it is known as pityriasis capitis.
It presents with bran-like scales of scalp present as patches within the hairy region of the head. The cause of this condition is not known but sometimes the causative agent is fungal infection by species known as Malassezia.
It can be seen in men and women, adults and elderly sometimes also seen in infants as cradle cap.