What contributes to dandruff formation on the scalp?

Dandruff formation on the scalp primarily results from a combination of dry skin and excess oil. Dry skin can lead to flaking as the scalp's moisture levels decrease, causing dead skin cells to shed more prominently. On the other hand, excess oil can create an environment conducive to the growth of yeast on the scalp, which can irritate the skin and lead to flakiness. This combination of dry skin and increased oil production results in the characteristic white or yellowish flakes associated with dandruff.

Other factors can influence dandruff, but the interaction between dry skin and oiliness remains the most significant contributor. For example, using oily hair products can exacerbate the situation by adding to the scalp's oiliness, while washing hair too frequently could sometimes strip natural oils and lead to a dry scalp, but these factors do not directly cause dandruff as effectively as the combination of dry skin and excess oil does. Wearing hats may trap oil and sweat, providing a breeding ground for yeast, but again, it’s not the primary cause of dandruff compared to the fundamental issues of scalp dryness and oiliness.