Acne

Blackheads are formed when oil collects and hardens in the pores of the skin. Oily skin not only attracts the dirt but also continually sheds the dead cells. Dirt, oil, sweat and stale make-up tend to clog and block the pores. These pores are exposed to the dirt and air, hence they turn black and are called the blackheads. Owing to blackheads the pores get blocked and oil glands get infected resulting in pimples. If the infection progresses, it ruptures the mechanism of oil glands and attacks the inner layer of the skin giving way to an ache prone condition.
Whiteheads are tiny, pearly, white raised spots. These are also caused due to excessive secretion of oil glands. But the clogged grease is not exposed to the air, so oxidation does not take place. Hence their tips do not get darkened.

Some remedies in this forum will help to remove blackheads & whiteheads.

When you wash off, splash the water on the face, the pores will close.

Also if you wash off with lukewarm water, never forget to give a cold water rinse. Because the pores which get opened by lukewarm water, wash get contracted if you rinse off with cold water.