Which statement best describes open comedo?

Open comedo is best described as a clogged hair follicle that is open to the surface of the skin, which is commonly known as a blackhead. This condition occurs when excess sebum (oil) and dead skin cells accumulate in the hair follicle, and when the follicle remains open, the trapped material oxidizes upon exposure to air, resulting in the characteristic dark coloration. Understanding this process is crucial in esthetics, as it relates to both skin health and aesthetic treatments.

The term “open” signifies that the comedo is not covered by skin, differentiating it from closed comedones, or whiteheads, where the follicle is blocked and the material is not exposed to air. Recognizing the nature of open comedones helps in appropriate skin care and treatment options, particularly for clients dealing with acne-prone skin.