What is an open follicle that is plugged with an oxidized black plug called?

An open follicle that is plugged with an oxidized black plug is known as a blackhead. Blackheads form when sebum, dead skin cells, and bacteria accumulate in the hair follicles. When this blockage comes into contact with air, the material within the follicle oxidizes, leading to the characteristic black discoloration. This oxidation process gives blackheads their name and differentiates them from closed comedones, or whiteheads, which do not have exposure to air, resulting in a white appearance.

Understanding the nature of blackheads is essential for effective skin care. They are a common form of acne and require specific treatments to help unclog the follicles and prevent future breakouts. Identifying blackheads accurately allows estheticians to provide targeted treatments, such as exfoliation or extraction, to improve skin clarity and health.