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is mainly due to viatmin deficiency , hereditary , scalp infections , hormone related , stress , aging.
I advise you to visit your Dermatologist
and get prescribed the appropriate medications.You may need vitamin supplements along with anti dandruff shampoo.
should be used for longer time to see efficient results.
is a very good option and is minimally invasive these days.
Hope I answered your question.If you need more information feel free to mail me.