Dandruff is one of the most common scalp conditions, affecting people of different ages and backgrounds. It is characterised by visible flakes of dead skin shedding from the scalp and may be accompanied by itching, irritation, and, in some cases, inflammation. Although dandruff is generally harmless, persistent symptoms can be uncomfortable and embarrassing, particularly when flakes are visible on the hair or clothing.

Dandruff is often regarded as the mildest form of seborrhoeic dermatitis. This inflammatory skin condition commonly affects areas rich in oil-producing glands, including the scalp, face and upper trunk. While seborrhoeic dermatitis can produce red, inflamed skin covered with greasy scales, ordinary dandruff usually involves flaking without significant redness or inflammation.

What Causes Dandruff?

No single cause of dandruff exists. It is better understood as the result of an interaction between the scalp's microorganisms, oil production, skin barrier and immune response. One of the organisms most closely associated with dandruff is Malassezia, a yeast that normally lives on the skin. An imbalance or overgrowth of this yeast may contribute to inflammation and increased scalp shedding in susceptible individuals.

Other factors can influence dandruff development or severity. Genetics may play a role, while hormonal changes can affect oil production and consequently scalp health. Environmental conditions, including hot and humid weather, may also aggravate symptoms. Hair-care practices can also contribute, particularly when products irritate the scalp or the scalp is not adequately cleansed.

Therefore, don't view dandruff as simply a hygiene issue. Regular cleansing can help control excess oil and dead skin, but the condition involves several biological and environmental factors.

Who Is Most Likely to Develop Dandruff?

Dandruff can affect almost anyone, although its severity varies from person to person. Hormonal changes associated with puberty, pregnancy and menopause can alter oil production and influence symptoms. People with naturally oily scalps may also be more susceptible.

Hair type and hair-care practices are relevant when treating the condition. People with curly, coily or textured hair may need to use medicated shampoos less frequently because some active ingredients can dry the hair. In these cases, apply the shampoo mainly to the scalp rather than the lengths of the hair.

Effective Treatment

Mild dandruff can usually be managed at home. Washing the hair and scalp regularly with a gentle shampoo helps remove excess oil and accumulated dead skin. When ordinary shampoo is insufficient, an over-the-counter medicated dandruff shampoo may be appropriate.

Different active ingredients work in different ways. Ketoconazole is an antifungal agent that targets fungi associated with dandruff, including Malassezia. Selenium sulfide also has antifungal properties and can help reduce flaking. Salicylic acid helps loosen and remove accumulated scales, making it useful when excessive scaling is the main problem. Coal tar can slow the excessive shedding of skin cells, although it may increase sensitivity to sunlight and can stain or discolour light-coloured hair.

Zinc pyrithione has traditionally been another widely used anti-dandruff ingredient because of its antifungal and antimicrobial properties. However, its regulatory status differs by jurisdiction, and some markets, including the European Union, have restricted or prohibited its use in cosmetic products. This has increased interest in alternative formulations that can provide effective treatment while meeting current safety requirements.

Researchers are also investigating natural and plant-derived ingredients as potential components of anti-dandruff formulations. For example, Salix purpurea (purple willow) bark extract has attracted attention because of its salicylate content and reported anti-inflammatory, antifungal and exfoliating properties. Such ingredients may offer useful possibilities, but their effectiveness and safety should be assessed based on appropriate scientific evidence rather than the fact that they are naturally derived.

How to Use Medicated Shampoo Properly

A dandruff shampoo's effectiveness depends not only on its active ingredient but also on how you use it. Apply the product directly to the scalp and gently massage it into the skin rather than simply spreading it over the hair. Many medicated shampoos must remain on the scalp for several minutes before rinsing so the active ingredient has enough contact time.

Follow the frequency of use listed on the product label. Some people may need medicated shampoo several times a week at first, while those with curly, coily, or textured hair may need less frequent use. Once symptoms are controlled, use can often be reduced to approximately once a week to help prevent recurrence.

If one product becomes less effective, alternating between shampoos with different active ingredients may help. However, persistent symptoms should not automatically be attributed to resistance. Dandruff-like symptoms can have several causes, and a change in diagnosis may sometimes explain why treatment is no longer effective.