What scalp condition involves excessive dryness and flaking?

The condition characterized by excessive dryness and flaking of the scalp is seborrheic dermatitis. This condition is a common skin disorder that primarily affects oily areas of the body, such as the scalp, face, and chest. It manifests as red, scaly patches and can be associated with dandruff. In seborrheic dermatitis, the overproduction of oil by sebaceous glands leads to irritation, resulting in the flaking and dryness that are key indicators of the condition.

The presence of flakes in seborrheic dermatitis often appears greasy and yellowish, unlike the drier flakes observed in other conditions. The underlying factors that contribute to seborrheic dermatitis can include genetics, hormonal changes, and the presence of a yeast called Malassezia that thrives on the scalp.

In contrast, psoriasis is an autoimmune condition that leads to rapid skin cell turnover, resulting in thick, red patches covered with silvery scales that are typically less flaky compared to those seen in seborrheic dermatitis. Folliculitis is an infection of the hair follicles, causing inflammation and small pustules but not specifically linked to excessive dryness or flaking. Contact dermatitis results from an allergic reaction or irritant contact, leading to red and inflamed skin but is