What causes it? Seborrheic dermatitis is linked to inflammation, oil-rich skin areas and sensitivity to yeast that normally lives on the skin. Stress, cold weather, illness and irregular treatment may worsen symptoms. It is not caused by poor hygiene and is not contagious.
Symptoms Common signs include white or yellow flakes, itching, redness and greasy scaling. Scratching can irritate the scalp and occasionally lead to infection.
Treatment Treatment may include anti-dandruff shampoos containing ketoconazole, selenium sulfide, zinc pyrithione, salicylic acid or other active ingredients. The shampoo usually needs time on the scalp before rinsing. Short courses of prescribed anti-inflammatory scalp solutions may be used for significant redness or itching.
Ongoing care The condition commonly returns, so maintenance shampoo once or twice weekly may be needed after improvement. A dermatologist should assess severe inflammation, hair loss, thick plaques, pain, pus or symptoms that do not improve with correct shampoo use.
Frequently Asked Questions
Is dandruff contagious?
No.
Does it cause permanent hair loss?
Usually no, but severe scratching and inflammation may increase shedding.
Can it affect the face?
Yes, especially eyebrows and the sides of the nose.
Why does it return?
It is often a chronic recurring condition that needs maintenance care.
This information is for education only and does not replace medical assessment or treatment by a qualified physician.