Which condition of the scalp is characterized by a lack of oil and moisture?

The condition of the scalp characterized by a lack of oil and moisture is dry scalp. A dry scalp occurs when there isn't enough sebum production, which is the natural oil that the scalp produces. This condition can lead to flakiness, itchiness, and irritation as the skin becomes dehydrated.

In contrast, oily scalp conditions are marked by an overproduction of sebum, leading to greasiness and potentially exacerbating issues such as dandruff. A normal scalp presents a balanced state of oil and moisture, while abrasions refer to physical injuries to the scalp rather than its moisture content. Therefore, identifying dry scalp as the correct answer informs about the importance of moisture and oil balance in maintaining scalp health.