Definitions for "Blackhead"
Keywords:  comedon, sebaceous, sebum, comedo, pore
A clogged pore on the surface of the skin; the dark color is due to exposure to the air.
A lesion seen in acne that is caused when the hair follicle becomes filled with a plug of oil, bacteria and cells but remains open to the skin surface. Because the plug is open and exposed to air, oxidation of one of the components of the plug causes the surface of the plug to turn black.
Also known as a comedone, caused by the hardening of the sebum in the sebaceous gland duct leading to the surface of the skin.
a intriguing industry and studying more about it is extremely advantageous
a stimulating field and studying more about it can prove to be quite productive
a stirring business and studying more about it can be very profitable
Keywords:  scaup, duck
The scaup duck.