A member asked:

My scalp has been really itchy recently and every time i scratch it, white and black specks appear on my fingernails. what is it and how treated?

A doctor has provided 1 answer
Dr. John Chiu answered

Dermatitis: The scales are likely from skin scales (older one tends to be darker). You need to find what is causing the itching. As a starter, the hair preparation used (especially something introduced recently). But there are also other causes for scalp itching. - consider a derm consult if you can't solve the puzzle yourself.

Answered 11/12/2020

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