The third phase of the life cycle of acne is inflammation. At this point, your body’s immune system may deal with the problem, but if it doesn’t, different bacteria can move into the pore. Detecting an enemy bacterial invader, your body responds by emitting white blood cells to the infected area. In some cases, the white blood cells have a difficult time fighting the bacteria, and some die, contributing to the oily buildup and creating pus.
Genetics is thought to be the primary cause of acne in 80% of cases.[2] The role of diet and cigarette smoking is unclear, and neither cleanliness nor exposure to sunlight appear to play a part.[2][13][14] In both sexes, hormones called androgens appear to be part of the underlying mechanism, by causing increased production of sebum.[5] Another frequent factor is excessive growth of the bacterium Propionibacterium acnes, which is normally present on the skin.[5]
Beyond making sure the system contains safe combinations of ingredients, a system can also treat all aspects of acne. By picking and choosing individual products, you may miss an important step. Plus, treatment systems contain ingredients like glycolic acid that help smooth acne scars, something you might not think about when you are shopping for products. Did you know probiotics help reduce inflammation? Or that kojic acid and arbutin can lighten brown spots? When it comes to treating acne, you should leave the mixing to professionals. You still can try out a variety of systems to find the one that works best for you.

Acne appears when a pore in our skin clogs. This clog begins with dead skin cells. Normally, dead skin cells rise to surface of the pore, and the body sheds the cells. When the body starts to make lots of sebum (see-bum), oil that keeps our skin from drying out, the dead skin cells can stick together inside the pore. Instead of rising to the surface, the cells become trapped inside the pore.
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