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frame|http://microbewiki.kenyon.edu/images/0/0f/Propionibacterium_acnes.jpg Acne vulgaris (translated as "the common acne") is a disease that can be caused by the pathogenic bacterium known as Propionibacterium acnes. Propionibacterium acnes is a bacterium that generates enzymes which degrade the skin. P. acnes shares a relationship in which it benefits and the human is not significantly harmed, known as a commensal relationship. Acne grows mainly on fatty acids in certain glands which are close to hair and the surface of skin, however it has been known to grow in the human digestive tract. P. acnes is on everyone's skin, however during puberty, the concentration of the pathogen is multiplied significantly. Acne vulgaris is commonly known as acne.

Transmission and Disease Desciption
Acne vulagaris, also known as acne, is in the kingdom Bacteria, the phylum Actinobacteria, the order Actinomycetales, and the family Propionibacteriacaea. The disease naturally grows, therefore requires no interaction to obtain. It first starts developing in the pores. Of course, since this does develop on the skin surface, it could technically be spread by human interaction. This transmission, of course, virtually does not happen.

It should be noted that acne is not solely caused by this pathogen.

Symptoms
The disease primarily causes deformations of the skin commonly referred to as pimples, zits, etc. In turn, these pimples can cause damage to the skin surface. Acne scars are scars in the skin caused by acne. These scars are actually more like indentations of the skin than scars, for no blood clotting is involved. Another minor effect can be pigmentation of the skin. Some people's skin can appear heavier in the color of yellow, more so than their native skin color.

Treatment
Propionibacterium acnes can be treatable. It is usually treated by antibiotics, however it can be treated by phages and Wood's light. The most commonly used antibiotics are ones that include the chemicals benzoyl peroxide and tetracycline. These antibiotics work by prohibiting the growth of certain bacterial ribosomes. These antibiotics are usually used as a cream or gel, applied to the surface of the skin, or they are taken through the mouth in form of a tablet.

Percent of population with the disease
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History of the disease/Scientific Breakthroughs
Around 100 years ago, propionibacterium acnes was known as bacillus acnes. Dermatologists had clearly identified information about the pathogen, and began testing it. Soon enough they began developing antibiotics. By the 1920s, dermatologists had developed a successful antibiotic to fight the pathogen (benzoyl peroxide). This resulted in a large drop in the percent of population with the disease. However, in the recent quarter-century, the pathogen has become increasingly resistant to antibiotics. This has reintroduced the debate on what the best solution to dealing with it is.

Controversy and Misconceptions
''Acne vulgaris can not be caused by stress. Historic studies have indicated that stress increases output of hormones, in effect causing a higher risk of acne, but modern tests point away from this theory.

According to a study involving a total of 47355 women, there is a direct link between the amount of dairy taken in and your risk of having acne. The connection itself is not yet known.

Contrary to popular belief, blackheads are not pieces of dirt, but a different form of acne.