Comedones
They will be the starting point of any acne. Start smaller blockages in the pores. At this stage, known as a block microcomedone name - the comedo is too small to be seen. Microcomedones comedones can develop into large, or they may burst
(rupture) internally, causing different types of stains. They burst due to pressure buildup and damage makes the inflammatory process in the wall of the duct.
White (closed comedones)
Some people think that the white dots as a kind of pus spots, but they are not. As microcomedone becomes larger due to swelling which builds up behind the blockage, is visible. If the initial block is deep enough in the pore opening to the skin is closed, which makes the typical whitish mass that can be seen and felt to the surface.
Blackheads (open comedones)
These are clearly visible and very annoying because they are so dark and light. Blockage occurred previously in the conduit, such that the opening widens and the content is visible. If you were to analyze your skin, you would see the sebaceous gland curly - which is the oil spill - full disk locked, yellow cap. This cap is a mixture of tallow coating is solidified and dead cells that have been shed. As they are, as the skin cells, which contain some pigment (melanin) which gives color to the skin. This pigment darkens when exposed to air, so that the "black" in "black spots" is not dirt.
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