What is the definition of a comedone?

A comedone is specifically defined as a non-inflamed buildup of cells, sebum, and other debris within hair follicles. This definition reflects the nature of a comedone, which can be seen as either a blackhead or a whitehead, depending on whether the follicle opening is closed or open.

When the follicle is open to the surface, the mixture of oil and dead skin cells can oxidize, resulting in a dark appearance—this is a blackhead. Conversely, when the follicle is blocked and closed, it can create a whitehead. This process is essential to understand, as comedones contribute to acne formation, and recognizing their characteristics is crucial for effective skin care treatments.

The other definitions are focused on different skin conditions or processes. Inflamed bacteria refers to infected acne, while redness and irritation are symptoms often associated with more serious skin conditions such as dermatitis. Excessive oil production can be a contributing factor to the formation of comedones but does not define what a comedone actually is. Understanding the precise nature of comedones can greatly assist estheticians in providing accurate treatments and recommendations to clients.