Describe the difference between closed and open comedones.

Closed comedones and open comedones are two types of acne lesions that are often discussed in esthetics and dermatology. The correct choice indicates that closed comedones are commonly referred to as whiteheads, whereas open comedones are known as blackheads.

Closed comedones occur when a hair follicle is clogged with oil and dead skin cells. The follicle is covered by skin, which gives it a white appearance, hence the name "whitehead." Because they are closed at the surface, the oxidization that leads to the dark color in open comedones does not occur, maintaining their white appearance.

In contrast, open comedones appear as small dark bumps on the skin's surface. The upper part of the clogged follicle is open to the air, which causes the oil (sebum) and dead skin cells inside to oxidize and turn dark, resulting in what we recognize as blackheads.

Recognizing the distinction between these two types of comedones is essential for effective skincare treatments and product recommendations. They require different approaches for management, with whiteheads often benefiting from treatments that reduce inflammation and promote exfoliation, while blackheads may be treated through extraction or products aimed at dissolving the oil and debris