Comedone
Comedone — a clogged hair follicle formed when a mix of excess oil and dead skin cells becomes trapped inside a pore. It is the most basic type of acne lesion and appears either as an open comedone, commonly called a blackhead, or a closed comedone, commonly called a whitehead.
Key points
- Open comedones look dark at the surface because the trapped material is exposed to air and oxidizes.
- Closed comedones stay covered by skin, giving them a small, flesh-colored or white bump appearance.
- Comedones are non-inflammatory, meaning they lack the redness and swelling of other acne lesions.
- They can develop into inflamed lesions if bacteria and immune response become involved.
- Ingredients like salicylic acid and retinoids are frequently discussed in the context of comedonal skin.
Frequently asked
What is the difference between a blackhead and a whitehead?
A blackhead is an open comedone whose contents darken on contact with air, while a whitehead is a closed comedone that remains covered by a thin layer of skin.
Are comedones a form of acne?
Yes, comedones are considered the most basic, non-inflammatory type of acne lesion, and persistent or bothersome breakouts are best discussed with a healthcare professional.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
