hard plug composed of sebum and dead skin cells. The mildest type of acne.
When the sebum plug of a comedo is exposed to air, it oxidizes and becomes a blackhead.
According to the NIH, it is called a comedo.
Comedones
comedo
A blackhead, or open comedo is a wide opening on the skin with a blackened mass of skin debris covering the opening. Despite their name, some blackheads can be yellowish in color. A comedo is a widened hair follicle which is filled with skin debris (keratin squamae), bacteria and oil (sebum). A closed comedo is a whitehead, while an open comedo is a blackhead. the plural of "comedo" is comedomes".
the plural word is comedones
Comedo
When sebum hardens and the sebaceous duct becomes clogged, the pore impaction that forms is known as a comedo. This can be either an open comedo, or blackhead, where the surface remains open, or a closed comedo, or whitehead, where the follicle is completely blocked. These impactions can lead to acne if bacteria proliferate in the clogged pore. Proper skincare can help prevent and manage these conditions.
Depends on the lesion. Could be comedonal, papular, pustular or nodular.
When the sebum plug of a comedo is exposed to air, it oxidizes and becomes a blackhead.
Another name for a blackhead is an open comedo. It is a type of acne that occurs when a hair follicle becomes clogged with oil, dead skin cells, and bacteria, which then oxidizes and turns dark when exposed to air.
The official definition of the word blackhead is "a plug of sebum in a hair follicle, darkened by oxidation."