Comedones

Definition

Comedones are clogged hair follicles (pores) in the skin, which can be open (blackheads) or closed (whiteheads). They are commonly associated with acne and result from a combination of excessive sebum production and buildup of dead skin cells.

5 Must Know Facts For Your Next Test

1. Comedones are classified as non-inflammatory acne lesions.
2. Propionibacterium acnes bacteria can colonize comedones, leading to inflammatory acne.
3. Excessive sebum production is a key factor in the formation of comedones.
4. Open comedones appear black due to oxidation, while closed comedones remain white.
5. Hormonal changes, especially during puberty, can increase the likelihood of developing comedones.

Review Questions

• What is the primary difference between open and closed comedones?
• Which bacterium is often found in colonized comedones leading to inflammation?
• How does excessive sebum contribute to the formation of comedones?

Related terms

Sebum:

An oily substance produced by sebaceous glands that can contribute to clogged pores.

Propionibacterium acnes:

A type of bacteria commonly found on skin that can cause inflammation in clogged pores.

Acne Vulgaris:

A common skin condition characterized by pimples, blackheads, and whiteheads due to clogged hair follicles.