Blackheads occur when your pores becomes blocked by sebum and dead skin. The black colour is not dirt. When the sebum and dead skin are exposed to the air they oxidize, which turns them black.There are many ways to get rid of them, from homespun remedies to medical treatments.lackheads occur when your pores becomes blocked by sebum and dead skin. The black colour is not dirt. When the sebum and dead skin are exposed to the air they oxidize, which turns them black.
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An antihemorrhagic (antihÃ¦morrhagic) agent is a substance that promotes hemostasis (stops bleeding). It may also be known as a hemostatic (also spelled hÃ¦mostatic) agent. A styptic (also spelled stiptic) is a specific type of antihemorrhagic agent that works by contracting tissue to seal injured blood vessels. Styptic pencils contain astringents.