#How do pimples, zits, acne, blackhead and whitehead appear?

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How do pimples, zits, acne, blackhead and whitehead appear? 
There are two kinds of sebaceous glands. One connects the follicle, and the other links the skin surface directly.  
 How do pimples, zits, acne, blackhead and whitehead appear
The frequent distributions of sebaceous gland are in forehead, cheek, chin, back, center of chest, and armpit.

If the oil secretion is seriously flourished, it sticks out from the skin and causes pimples , zits and acne.


As the sebum touch the air, it oxidizes and turns into black color. That is blackhead.
The whitehead is oil secretion seriously flourished. But it can’t excrete out of the skin, it starts to block in the sebaceous gland and stretches the gland space. If the space has bacteria, it would become inflamed pimple and fill with pus. 

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