Dandruff — those white flakes and the itchy scalp — is usually driven by a common scalp yeast (Malassezia) and how your scalp's oils respond to it. It is not a hygiene failure.
Malassezia lives on nearly everyone's scalp. In some people it irritates the skin and speeds up skin-cell turnover — the extra shedding shows up as visible flakes. Stress, cold dry weather, and infrequent washing can amplify it.
Anti-dandruff actives with real support include zinc pyrithione, ketoconazole, selenium sulfide and salicylic acid. Using one consistently — lathered and left on the scalp for a few minutes before rinsing — is the mainstay of control.
Regular washing prevents oil and yeast build-up. Heavy oiling can actually feed Malassezia for some people — a popular habit worth questioning if flakes persist. Very hot water and harsh scratching aggravate the scalp.
Thick silvery scales, red inflamed patches extending beyond the hairline, or no response to weeks of proper anti-dandruff care suggest psoriasis, seborrheic dermatitis or other conditions a dermatologist should assess.
This article is educational and general. Your situation has its own context — for symptoms that are severe, sudden, persistent or worrying, consult a qualified medical practitioner.
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