What is the black in blackheads?

I usually ask questions about mythology... but I was just wondering what that black stuff was...What is the black in blackheads?
Blackhead: A familiar term for what is medically called an open comedo.





A comedo, the primary sign of acne, consists of a dilated (widened) hair follicle filled with keratin squamae (skin debris), bacteria, and sebum (oil).





An open comedo has a wide opening to the skin and is capped with a blackened mass of skin debris.





By contrast, a closed comedo has an obstructed opening to the skin and may rupture to cause a low-grade skin inflammatory reaction in the area. The common name for a closed comedo is a whitehead.





Acne occurs when sebaceous glands of the skin begin to secrete oil during puberty. These glands are stimulated by male hormones that are produced in the adrenal glands of both boys and girls. The oil lubricates and protects the skin. Under certain circumstances, cells that are close to the openings of the sebaceous glands block the openings. This causes a buildup of oil underneath the skin. Bacteria, which live in everyone's skin but generally mind their own business, feast on this oil, multiply, and cause the surrounding tissues to become inflamed.





If the inflammation is right near the surface, a pustule is formed; if it is deeper, a papule (pimple); deeper still and it becomes a cyst. If the oil breaks though to the surface, the result is a whitehead. If the oil becomes oxidized (that is, acted on by oxygen in the air), the oil changes from white to black, and the result is a blackhead. This is how the two types of comedones develop.





http://www.medterms.com/script/main/art.鈥?/a>What is the black in blackheads?
It is a clog of sebum in your pores. It starts as a whitehead and as things build up around it, it turns black.


It isn't usually a sign of lack of personal hygiene, just a fact of life. ^^
The black stuff is not dirt. It just the tip of the blackhead that gets that dark color when it reaches the surface.
bacteria under ur skin
Bacteria and the natural oils on your skin.





Nasty - yes.