Oregon Esthetician State Board

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Which type of comedo is open at the surface and exposed to air?

Blackhead
Whitehead
Steatoma
Milia

The correct answer is: Blackhead

The type of comedo that is open at the surface and exposed to air is characterized as a blackhead. Blackheads occur when a hair follicle becomes clogged with oil, dead skin cells, and other debris. Because the clogged material is exposed to the air, it undergoes oxidation, resulting in the dark color associated with blackheads. This contrasts with other types of comedones, such as whiteheads, which remain closed beneath the skin's surface; they appear white due to the trapped sebum and debris that are not oxidized. Understanding the differences between these types of comedones is crucial in esthetics, as it informs appropriate treatment and skincare options.