Plugging of the Duct
 The duct of the oil gland becomes plugging in those who suffer with acne. Such duct plugging is usually called ductal hypercornification. This leads to the comedones production which are also known as whiteheads and blackheads. The more comedones a person has the more severe acne may be. This can be described as causing plugging of the duct so the sebum does not flow freely out of the duct.
Blackheads are not caused by not cleaning enough or being dirty. Black spots are caused by the sebum being oxidised. Scrubbing and scouring the skin will not stop or clear blackheads and can cause problems in itself.
Bacteria
Acne isn’t transmissible and can't be passed on from body to body. It is noted that bacteria are involved with the cause of acne but not the types of bacteria that cause impetigo, boils or wound infections. The bacteria linked with causing acne is called Propionibacterium acnes and colonize the sebum in the sebaceous ducts and glands.
Excess Inflammation
The precise cause of the inflammation in acne is not known but some scientists think that it is the chemicals that are made by the Propionibacterium acnes that cause the immune system to cause excessive inflammation.
Why Do Certain People Get Acne?
In those individuals who have acne, one or more of their parents is most likely to have had acne. This shows the genetic cause of the condition. The exact genes that are linked with acne are not known and it is likely to be a combination of a few different types of genes that are inherited from an individual’s parents.
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