What is a dry, scaly skin condition due to a deficiency or absence of sebum caused by old age or other factors?

The condition described is truly a result of a deficiency or absence of sebum, which is an oily substance produced by sebaceous glands. Asteatosis, often referred to as xerosis or dry skin, primarily occurs when the skin does not retain enough moisture, leading to dryness, flaking, and scaling. This can be exacerbated by factors such as aging, where natural sebum production decreases, or external elements like cold weather, low humidity, and certain soaps that strip the skin of its natural oils.

Understanding this condition is important for those in the cosmetic and skincare fields, as it emphasizes the need for proper hydration and moisturizing practices. Other options like dermatitis, eczema, and psoriasis are skin conditions characterized more by inflammation and other symptoms, rather than specifically a lack of sebum. Thus, recognizing asteatosis is key for addressing issues related to dry skin effectively.