A comedo, also known as a blackhead or whitehead, is a type of acne lesion that forms when a hair follicle becomes clogged with oil, dead skin cells, and bacteria. Comedones are typically found on the face, especially in areas such as the forehead, nose, and chin, but they can also occur on the chest, back, and shoulders.
There are two types of comedones:
- Blackheads: Blackheads are open comedones that appear as small, dark bumps on the skin's surface. The dark color is not due to dirt but rather the oxidation of melanin (skin pigment) when it comes into contact with air.
- Whiteheads: Whiteheads are closed comedones that are covered by a thin layer of skin. They appear as small, flesh-colored or white bumps on the skin. Comedones are a result of excess oil production (sebum), abnormal shedding of dead skin cells, and the proliferation of bacteria.
Treatment Options for Comedo
- Topical treatments: Over-the-counter or prescription creams, gels, or lotions containing ingredients such as benzoyl peroxide, salicylic acid, or retinoids can help unclog the pores and reduce inflammation.
- Extraction: A dermatologist can perform professional extraction of comedones using specialized tools to remove the clog from the pore.
- Chemical peels: Chemical peels involve applying a solution to the skin, which helps exfoliate the outer layer and unclog the pores.
- Oral medications: In severe cases of acne, oral medications such as antibiotics, hormonal treatments (e.g., oral contraceptives or spironolactone), or isotretinoin (Accutane) may be prescribed.


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