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excessive flaking of skin from the scalp, apparent as dry or greasy diffuse scaling with variable itching. It is the sign of a skin disease, such as seborrhea or a fungal infection. Treatment requires the use of shampoos containing pyrithione zinc, selenium sulfide, sulfur and salicylic acid, or tar shampoo used daily until the dandruff is under control.



grayish white scaly material that is desquamated from the epidermis of the scalp. The formation of dandruff may be a normal occurrence or a symptom of such skin diseases as seborrhea.


Scales of dry sebum formed on the scalp in seborrhea.


loose scales of dry dead skin shed from the scalp