Seboraic dermatit

Seborrheic dermatitis, often referred to as medical grade dandruff, is a condition characterized by redness, flaking, and dryness of the scalp. It is primarily caused by an overgrowth of yeast that feeds on the sweat and oil produced by the scalp. To manage this condition, treatments typically involve reducing the amount of yeast with the use of special shampoos, such as those containing zinc or ketoconazole, which are available both over the counter and by prescription. Additionally, dampening the immune response to the yeast overgrowth is important, often using topical treatments that suppress the skin's immune reaction 1.

The hair on the scalp is not alive, and so treating the hair itself will not improve scalp conditions like seborrheic dermatitis. The focus is on treating the skin of the scalp and managing the immune system's response 1.