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What are comedones?
Comedones are the skin-coloured, small bumps (papules) frequently found on the forehead and chin of those with acne. A single lesion is a comedo.
Open comedones are blackheads; black because of surface pigment (melanin), rather than dirt
Closed comedones are whiteheads; the follicle is completely blocked
Microcomedones are so small that they are not visible to the naked eye
Macrocomedones are facial closed comedones that are larger than 2–3 mm in diameter
A giant comedo is a type of cyst in which there is a clear blackhead-like opening in the skin
Solar comedones are found on the cheeks and chin of older people, and are thought to be due to sun damage