What should you know about an itchy and irritated scalp?

Look for clues alongside the itch. Loose white or yellowish flakes can occur with dandruff or seborrheic dermatitis. Thick, clearly defined plaques may fit scalp psoriasis. Tender bumps, pustules, or crusting can occur with folliculitis. Tiny insects or firmly attached eggs in the hair may point to head lice. Burning or itching that began soon after dye, shampoo, oils, or styling products can reflect irritation or contact allergy.

An itchy scalp is a symptom rather than a diagnosis. Scratching can break the skin, increase soreness, and make infection easier, so the appearance of the scalp and the timing of symptoms help guide the assessment.

Pause any newly introduced hair or scalp product and rinse gently with lukewarm water. Avoid scratching, tight hairstyles, vigorous brushing, and picking at scales or scabs. Keep combs, brushes, hats, and towels personal until head lice have been excluded. If flaking is the main feature, a clinician or pharmacist can help you choose an appropriate medicated shampoo and explain how often to use it; follow the product directions and stop if it causes marked burning or swelling.

Arrange a dermatology assessment when the cause is unclear, symptoms keep returning, or home measures do not settle the irritation. Treatment differs for dandruff, seborrheic dermatitis, psoriasis, folliculitis, and head lice.

Seek prompt medical care for rapidly spreading redness, warmth, swelling, pus, significant pain, fever, or open areas that are worsening. Get urgent help if scalp or facial swelling comes with trouble breathing, wheezing, or swelling of the lips or tongue. Book an appointment for persistent scaling, bleeding from scratching, patchy hair loss, broken hairs, or symptoms affecting sleep or daily activities.

Ask: What features suggest dandruff, psoriasis, folliculitis, lice, or a product reaction? Should I use a medicated shampoo, and how should it be applied? Could any of my medicines or hair products be contributing? What signs would mean I should return sooner?