Arizona Esthetics State Board Practice Exam

Oily skin is most prone to acne due to the increased production of sebum, which is the natural oil produced by the sebaceous glands. When there's an excess of sebum, it can mix with dead skin cells and clog pores, creating an environment conducive to the growth of acne-causing bacteria. The clogged pores can lead to different forms of acne, such as blackheads, whiteheads, and cystic lesions.

In contrast, while dry and normal skin types may experience acne to some extent, they typically do not have the same level of oiliness and thus are less likely to develop acne. Combination skin, which includes both oily and dry areas, may experience acne primarily in the oily zones, but overall, oily skin remains the predominant type associated with higher rates of acne.