Pityriasis simplex (dandruff)

Pityriasis simplex is known more commonly as dandruff. It is characterised by the excessive shedding of the scalp's epidermal cells, which leads to visible flaking or scaling. These scales can accumulate on the surface of the scalp in localized patches or more diffusely. The exact cause is uncertain, although the bacteria pityrosporum ovale and increased sebaceous activity have been suggested as factors.