What does the term "comedo" refer to in skin terminology?

The term "comedo" refers specifically to a clogged hair follicle, which can take the form of either a blackhead or a whitehead. When a hair follicle becomes obstructed with oil, dead skin cells, and sometimes bacteria, it leads to the formation of a comedo. In blackheads, the opening of the clogged follicle is open to the air, which causes the oxidation of melanin in the debris, leading to a dark appearance. In whiteheads, the follicle is closed, resulting in a white or flesh-colored bump. This terminology is crucial in the field of esthetics, as understanding the types of comedones can aid in effective skin analysis and treatment planning for clients experiencing acne. Recognizing a comedo is essential for estheticians, who often recommend treatments and products to clear the skin and prevent further breakouts.