Globally, acne affects approximately 650 million people, or about 9.4% of the population, as of 2010.[157] It affects nearly 90% of people in Western societies during their teenage years, but can occur before adolescence and may persist into adulthood.[18][19][22] While acne that first develops between the ages of 21 and 25 is uncommon, it affects 54% of women and 40% of men older than 25 years of age,[46][158] and has a lifetime prevalence of 85%.[46] About 20% of those affected have moderate or severe cases.[2] It is slightly more common in females than males (9.8% versus 9.0%).[157] In those over 40 years old, 1% of males and 5% of females still have problems.[19]
Pimples are raised red spots with a white center that develop when blocked hair follicles become inflamed or infected with bacteria. Blockages and inflammation that develop deep inside hair follicles produce cystlike lumps beneath the surface of your skin. Other pores in your skin, which are the openings of the sweat glands, aren't usually involved in acne.

This problem is normally located on the face, back, and upper portion of the chest. These areas are worst hit because they have the highest number of oily glands. What a lot of people don’t realize is that there are several different types of this issue. And to make matter even more complicated, each of these types have their own causes and effects as well as methods of prevention. [3]
Hormonal activity, such as occurs during menstrual cycles and puberty, may contribute to the formation of acne. During puberty, an increase in sex hormones called androgens causes the skin follicle glands to grow larger and make more oily sebum.[12] Several hormones have been linked to acne, including the androgens testosterone, dihydrotestosterone (DHT), and dehydroepiandrosterone (DHEA); high levels of growth hormone (GH) and insulin-like growth factor 1 (IGF-1) have also been associated with worsened acne.[41] Both androgens and IGF-1 seem to be essential for acne to occur, as acne does not develop in individuals with complete androgen insensitivity syndrome (CAIS) or Laron syndrome (insensitivity to GH, resulting in very low IGF-1 levels).[42][43]
The approach to acne treatment underwent significant changes during the twentieth century. Retinoids were introduced as a medical treatment for acne in 1943.[83] Benzoyl peroxide was first proposed as a treatment in 1958 and has been routinely used for this purpose since the 1960s.[167] Acne treatment was modified in the 1950s with the introduction of oral tetracycline antibiotics (such as minocycline). These reinforced the idea amongst dermatologists that bacterial growth on the skin plays an important role in causing acne.[163] Subsequently, in the 1970s tretinoin (original trade name Retin A) was found to be an effective treatment.[168] The development of oral isotretinoin (sold as Accutane and Roaccutane) followed in 1980.[169] After its introduction in the United States it was recognized as a medication highly likely to cause birth defects if taken during pregnancy. In the United States, more than 2,000 women became pregnant while taking isotretinoin between 1982 and 2003, with most pregnancies ending in abortion or miscarriage. About 160 babies were born with birth defects.[170][171]
Acne vulgaris is a chronic skin disease of the pilosebaceous unit and develops due to blockages in the skin's hair follicles. These blockages are thought to occur as a result of the following four abnormal processes: a higher than normal amount of oily sebum production (influenced by androgens), excessive deposition of the protein keratin leading to comedo formation, colonization of the follicle by Propionibacterium acnes (P. acnes) bacteria, and the local release of pro-inflammatory chemicals in the skin.[49]
Your pimples need TLC, too. The study on acne vulgaris found that, in an attempt to dry out acne lesions, patients often use too many products or apply excessive amounts to problem areas, resulting in further irritation and over drying of the skin. Vigorous scrubbing and using harsh exfoliants can make acne worse by rupturing whiteheads and blackheads, turning them into painful red ones. And remember: no matter how satisfying it is, picking and popping your zits will also increase inflammation and opportunity for infection.
The severity of acne vulgaris (Gr. ἀκµή, "point" + L. vulgaris, "common")[23] can be classified as mild, moderate, or severe as this helps to determine an appropriate treatment regimen.[19] Mild acne is classically defined by the presence of clogged skin follicles (known as comedones) limited to the face with occasional inflammatory lesions.[19] Moderate severity acne is said to occur when a higher number of inflammatory papules and pustules occur on the face compared to mild cases of acne and are found on the trunk of the body.[19] Severe acne is said to occur when nodules (the painful 'bumps' lying under the skin) are the characteristic facial lesions and involvement of the trunk is extensive.[19][24]
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Dapsone is not a first-line topical antibiotic due to higher cost and lack of clear superiority over other antibiotics.[1] Topical dapsone is not recommended for use with benzoyl peroxide due to yellow-orange skin discoloration with this combination.[10] While minocycline is shown to be an effective acne treatment, it is no longer recommended as a first-line antibiotic due to a lack of evidence that it is better than other treatments, and concerns of safety compared to other tetracyclines.[88]
Warning: Sulfur smells like rotten eggs. But it is an effective ingredient at drying up pus-filled pimples and whiteheads (you’ve gotta take the good with the bad). It works by sucking up the oil. Sulfur is typically mixed with other active ingredients to get the most efficacy and fragrances to mask the strong scent. You can often find it in masks and spot treatments.
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Acne vulgaris is a chronic skin disease of the pilosebaceous unit and develops due to blockages in the skin's hair follicles. These blockages are thought to occur as a result of the following four abnormal processes: a higher than normal amount of oily sebum production (influenced by androgens), excessive deposition of the protein keratin leading to comedo formation, colonization of the follicle by Propionibacterium acnes (P. acnes) bacteria, and the local release of pro-inflammatory chemicals in the skin.[49]

Having a specific type of skin now doesn’t mean you will be stuck with it the rest of your life. As you get older, your skin can change. It may be oily when you are younger but become dry as you age. Plus, skin can become more or less sensitive over time. It’s always a good idea to retest for your skin type if you notice any changes. We’ve included a guide above to help you recognize what kind of acne you have, what the average causes are, and how to treat it (or at least not aggravate it).
In terms of their effectiveness, both these ingredients are beneficial. Any related product worth its salt will have either one of these in their formula. In fact, some products incorporate both. However, in saying this, our research has provided conclusive proof that salicylic acid is the one to choose. Below are the main points as to why we think this is the case:
Benzoyl peroxide (BPO) is a first-line treatment for mild and moderate acne due to its effectiveness and mild side-effects (mainly skin irritation). In the skin follicle, benzoyl peroxide kills P. acnes by oxidizing its proteins through the formation of oxygen free radicals and benzoic acid. These free radicals are thought to interfere with the bacterium's metabolism and ability to make proteins.[79][80] Additionally, benzoyl peroxide is mildly effective at breaking down comedones and inhibiting inflammation.[78][80] Benzoyl peroxide may be paired with a topical antibiotic or retinoid such as benzoyl peroxide/clindamycin and benzoyl peroxide/adapalene, respectively.[35]
But the side effects of targeted breakout cream treatments aren’t always worth it. “So many products instruct consumers to use benzoyl peroxide spot treat red bumps and pustules. I don’t recommend it,” says Dr. Lawrence Green, board-certified dermatologist and assistant clinical professor of dermatology at George Washington University. Such high concentrations of benzoyl peroxide cause added irritation and inflammation to already sensitive skin, so with this in mind, we cut kits that included spot treatments.
But Accutane has mixed reviews for a reason. It makes the skin super dry and sensitive, which means it’s important to keep moisturizers and lip balm nearby while you’re on the treatment. Oh, and don’t even think about waxing your eyebrows (just imagine your skin ripping off). There’s another downside to Accutane: It requires a lot of paperwork and office visits. Since isotretinoin can cause birth defects, you have to come into the dermatologist once a month to get a pregnancy test and take a lengthy survey with embarrassing questions about your sex life to prove that you are using sufficient birth control. These precautions are intense, but dermatologists agree that the final results for Accutane are like no other. “This is one of the few medicines that I can look [patients] in the eye and guarantee them it will work,” says Friedman.
Dermabrasion is an effective therapeutic procedure for reducing the appearance of superficial atrophic scars of the boxcar and rolling varieties.[31] Ice-pick scars do not respond well to treatment with dermabrasion due to their depth.[31] The procedure is painful and has many potential side effects such as skin sensitivity to sunlight, redness, and decreased pigmentation of the skin.[31] Dermabrasion has fallen out of favor with the introduction of laser resurfacing.[31] Unlike dermabrasion, there is no evidence that microdermabrasion is an effective treatment for acne.[8]
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