The approach to acne treatment underwent significant changes during the twentieth century. Retinoids were introduced as a medical treatment for acne in 1943.[82] 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]

Isotretinoin is an oral retinoid that is very effective for severe nodular acne, and moderate acne that is stubborn to other treatments.[1][20] One to two months use is typically adequate to see improvement. Acne often resolves completely or is much milder after a 4–6 month course of oral isotretinoin.[1] After a single course, about 80% of people report an improvement, with more than 50% reporting complete remission.[20] About 20% of patients require a second course.[20] Concerns have emerged that isotretinoin use is linked with an increased risk of adverse effects, like depression, suicidality, anemia, although there is no clear evidence to support some of these claims.[1][20] Isotretinoin is superior to antibiotics or placebo in reducing acne lesions.[17] The frequency of adverse events was about twice as high with isotretinoin, although these were mostly dryness-related events.[17] No increased risk of suicide or depression was conclusively found.[17] Isotretinoin use in women of childbearing age is regulated due to its known harmful effects in pregnancy.[20] For such a woman to be considered a candidate for isotretinoin, she must have a confirmed negative pregnancy test and use an effective form of birth control.[20] In 2008, the United States started the iPLEDGE program to prevent isotretinoin use during pregnancy.[84] iPledge requires the woman under consideration for isotretinoin therapy to have two negative pregnancy tests and mandates the use of two types of birth control for at least one month before therapy begins and one month after therapy is complete.[84] The effectiveness of the iPledge program has been questioned due to continued instances of contraception nonadherence.[84][85]
Some people swear by the disinfecting power of tea tree oil for acne treatment. It can be applied either full strength or slightly diluted with water directly onto pimples. Use a small amount on a clean cotton swab or cotton pad and dab on the affected areas immediately after cleansing. Because tea tree oil can be drying, you might choose to use both tea tree oil and coconut oil for acne as part of your clear skin regimen.
It starts when greasy secretions from the skin's sebaceous glands (oil glands) plug the tiny openings for hair follicles (plugged pores). If the openings are large, the clogs take the form of blackheads: small, flat spots with dark centers. If the openings stay small, the clogs take the form of whiteheads: small, flesh-colored bumps. Both types of plugged pores can develop into swollen, tender inflammations or pimples or deeper lumps or nodules. Nodules associated with severe cases of acne (cystic acne) are firm swellings below the skin's surface that become inflamed, tender, and sometimes infected.

Acne scars are caused by inflammation within the dermal layer of skin and are estimated to affect 95% of people with acne vulgaris.[31] The scar is created by abnormal healing following this dermal inflammation.[32] Scarring is most likely to take place with severe acne, but may occur with any form of acne vulgaris.[31] Acne scars are classified based on whether the abnormal healing response following dermal inflammation leads to excess collagen deposition or loss at the site of the acne lesion.[33]

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For an overnight solution or something that covers a larger surface area (rather than a smaller spot-treatment), Zeichner also recommends Neutrogena’s rapid-clear leave-on mask. The idea is that you spread benzoyl peroxide all over your face, but it’s not a wash-off mask, so you’re getting a prolonged exposure to the antibacterial peroxide. He says it’s helpful for treating the pimples you have and preventing new ones from popping up.
Some people swear by the disinfecting power of tea tree oil for acne treatment. It can be applied either full strength or slightly diluted with water directly onto pimples. Use a small amount on a clean cotton swab or cotton pad and dab on the affected areas immediately after cleansing. Because tea tree oil can be drying, you might choose to use both tea tree oil and coconut oil for acne as part of your clear skin regimen.

All the dermatologists we talked to agreed that there is no one-size-fits-all solution to acne. Every patient responds to treatments differently, and sometimes it can get worse before it gets better. But with the help of your dermatologist, you can find an acne treatment regimen that works for you. And, yes, we do stress how helpful it is to work with a derm to get it right.
Bowling was right not to worry. Baby acne — or newborn acne, as it’s called to distinguish it from infantile acne, which occurs in older babies — is usually harmless and quite common. “It occurs in about 20 percent of newborns, typically around the time when they’re 3 – to 4-weeks-old,” says Mary Yurko, M.D., PhD, a pediatric dermatologist in Grand Rapids, Michigan.
C. acnes also provokes skin inflammation by altering the fatty composition of oily sebum.[45] Oxidation of the lipid squalene by C. acnes is of particular importance. Squalene oxidation activates NF-κB (a protein complex) and consequently increases IL-1α levels.[45] Additionally, squalene oxidation leads to increased activity of the 5-lipoxygenase enzyme responsible for conversion of arachidonic acid to leukotriene B4 (LTB4).[45] LTB4 promotes skin inflammation by acting on the peroxisome proliferator-activated receptor alpha (PPARα) protein.[45] PPARα increases activity of activator protein 1 (AP-1) and NF-κB, thereby leading to the recruitment of inflammatory T cells.[45] The inflammatory properties of C. acnes can be further explained by the bacterium's ability to convert sebum triglycerides to pro-inflammatory free fatty acids via secretion of the enzyme lipase.[45] These free fatty acids spur production of cathelicidin, HBD1, and HBD2, thus leading to further inflammation.[45]
For an overnight solution or something that covers a larger surface area (rather than a smaller spot-treatment), Zeichner also recommends Neutrogena’s rapid-clear leave-on mask. The idea is that you spread benzoyl peroxide all over your face, but it’s not a wash-off mask, so you’re getting a prolonged exposure to the antibacterial peroxide. He says it’s helpful for treating the pimples you have and preventing new ones from popping up.
Alternative and integrative medicine approaches used in the treatment of acne include fish oil, brewer's yeast, probiotics, oral zinc and topical tea tree oil. More research is needed to establish the potential effectiveness and long-term safety of these and other integrative approaches, such as biofeedback and traditional Chinese medicine. Talk with your doctor about the pros and cons of specific treatments before you try them.
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