Which skin disorder is characterized by the development of yellowish, greasy scales?

Seborrheic dermatitis is characterized by yellowish, greasy scales that typically appear on areas of the body rich in sebaceous (oil) glands, such as the scalp, face, and trunk. This skin condition may present as flaking, redness, and irritation, and the scales can vary from mild to severe in severity. The presence of oiliness, along with the scaliness, helps distinguish it from other skin disorders.

In seborrheic dermatitis, the yellowish coloration is due to the accumulation of sebum, which combines with dead skin cells, leading to the formation of these greasy scales. The condition is commonly associated with factors such as hormonal changes, stress, and possibly an overgrowth of Malassezia yeast, which is a normal inhabitant of the skin.

Understanding the presentation of seborrheic dermatitis allows for accurate diagnosis and treatment, which may include topical antifungals, anti-inflammatory medications, or medicated shampoos containing ingredients like ketoconazole or zinc pyrithione to help reduce the fungal component and manage inflammation.