The strong sebum production and the changing keratinisation the skin causes the execution of programs with yellow white "sausages" made of horn and tallow fill. On the surface they are, if you just handiest as blackheads (comedones) visible: Hubbell tiny white or black dots. The white skin is covered, not the black.
The dark color comes from the fact that in the Horn-/Talgmasse melanin is a little bit – that is the skin pigment, which makes that you will brown if the sun it seems. Furthermore darken the Talg-/Horngemisch by oxidation – the so-called chemical reaction with air. The dark color has nothing to do with dirt. Blackheads with nowhere to eat well. Previously thought but, so hot it is still so.
If the Horn-/Teargases the clogged pores, bacteria can be certain that was actually quite normal in your skin occur unusually multiply. That can lead to inflammation – and then one from a blackhead pimple. A pimple recognize you as a reddened Hubbell, often with a white pus point. Because you in the face, on the shoulders to the chest and the back very strongly developed sebaceous glands you will find it especially blackheads and pimples discover.
The increased tendency to blackheads and acne pimples doctors call. If you are in puberty have acne, your skin is not sick, it behaves just like they are in puberty just behaves.
Sometimes spreads from an inflammation, and form larger nodes. Now, one speaks of serious, large acne. The nodes as scars heal.
Neither blackheads nor even pimples severe forms of acne are contagious.