When whiteheads and blackheads become infected with bacteria, called Propionibacterium acnes, it leads to inflammatory acne. Regular bacteria is found in most whiteheads and blackheads, but P. acnes is attracted to the closed, oily environment. This bacteria makes acne more difficult to treat. The four different pimple types that characterize inflammatory acne are papules, pustules, nodules and cysts.

Hypertrophic scars are uncommon, and are characterized by increased collagen content after the abnormal healing response.[31] They are described as firm and raised from the skin.[31][33] Hypertrophic scars remain within the original margins of the wound, whereas keloid scars can form scar tissue outside of these borders.[31] Keloid scars from acne occur more often in men and people with darker skin, and usually occur on the trunk of the body.[31]
Considerations: Benzoyl peroxide is able to produce complete clearing of acne only when used in an adequate dosage and within a properly applied benzoyl peroxide regimen. Some dryness, redness, and itchiness is to be expected in the first few weeks of use.6 Scientists call this initial period the "hardening effect" of benzoyl peroxide. About 1-3% of people are allergic to benzoyl peroxide and experience an inflammation of the skin or severe crusting.3This should not be confused with the "hardening effect" of benzoyl peroxide. Benzoyl peroxide, like any other peroxide, can bleach hair and fabric.1
Use acne treatments for all areas of the body that have acne. Thus, you will increase your chances to completely get rid of this problem. Protect your skin. Skin care does not end when you leave the bathroom. Use a concealer with SPF-filter and other means to protect from the sun, wind and frost. Ultraviolet and temperature changes – not only lead to the appearance of skin defects, but also accelerate aging.

Acne is the most common skin condition in the United States. Between 40 and 50 million Americans have it. It occurs at any age, but most sufferers are teenagers and young adults. Research shows four key players are involved in its formation: excess oil, clogged pores, bacteria and inflammation. The excess oil is sebum which our bodies make to prevent the skin from drying out. Sebum increases dramatically during adolescence when hormones known as androgens spur sebum production into overdrive. If excess sebum cannot flow freely to the skin’s surface, clogged pores result. P. acnes, a bacteria found on everyone’s skin, flourishes in the excess oil and results in inflammation.


Scars (permanent): People who get acne cysts and nodules often see scars when the acne clears. You can prevent these scars. Be sure to see a dermatologist for treatment if you get acne early — between 8 and 12 years old. If someone in your family had acne cysts and nodules, you also should see a dermatologist if you get acne. Treating acne before cysts and nodules appear can prevent scars.
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