What should you know about serious dandruff?

Dandruff can produce white or yellowish flakes, scalp itch, and irritation. Seborrheic dermatitis may cause more inflamed, greasy, or scaly patches and can affect the eyebrows, ears, nose folds, or chest as well as the scalp. Other conditions, including psoriasis, contact dermatitis, or a fungal infection, can look similar. Scratching can break the skin and create soreness or crusting, which makes the scalp harder to judge by appearance alone.

Use a medicated shampoo according to its label or your clinician’s instructions, allowing it to remain on the scalp for the recommended contact time. Rinse thoroughly and avoid scratching, very hot water, and products that sting. If flakes remain heavy, the scalp is very itchy, or patches extend beyond the hairline, arrange a dermatology review. Treatment may involve medicated shampoo therapy or a topical antifungal treatment, depending on the cause.

Arrange prompt medical care for painful swelling, pus, bleeding, thick crusts, marked hair loss, fever, or a rapidly worsening rash. Seek urgent help if facial swelling, breathing difficulty, or a severe reaction follows a hair or scalp product. Persistent flaking with broken skin needs assessment because infection or another inflammatory condition may require a different treatment.

Ask what diagnosis best fits the scale and redness, how often to use treatment, when to stop or change a product, and whether affected skin outside the scalp needs separate care. Mention new hair products, medicines, allergies, and any areas of hair loss or drainage.