Skin bacteria on their own do not cause acne. However acne causing bacteria could be defined as the bacteria called Propionbacterium acnes (P. Acnes) which lives on all skin types and is part of the skin’s natural maintenance system.
When a follicle is clogged, this acne causing bacteria multiplies and causing a chemical reaction that results in inflammation and spots. Acne treatments are designed to fight this bacteria and reduce inflammation by decreasing oil production and cleansing the pores.
Also when several types of bacteria are trapped underneath the skin, they can react with sebum and break down into free fatty acids resulting in damage and inflammation in the deeper parts of the skin.
The first signs of this are redness and swelling. Within 3 days of this inflammation starting, white blood cells start attacking the bacteria and try to get them out the body. This is how pustules are formed and develop.
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