^ White, Stephen D.; Bordeau, Patrick B.; Blumstein, Philippe; Ibisch, Catherine; GuaguÈre, Eric; Denerolle, Philippe; Carlotti, Didier N.; Scott, Katherine V. (1 September 1997). "Feline acne and results of treatment with mupirocin in an open clinical trial: 25 cases (1994–96)". Veterinary Dermatology. 8 (3): 157–164. doi:10.1046/j.1365-3164.1997.d01-16.x. ISSN 1365-3164.
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]
Salicylic Acid – One of the most common topical ingredients you can find over-the-counter, salicylic acid is generally used to reduce the appearance of acne, by reducing swelling and redness. Also known as a beta-hydroxy acid, it exfoliates your skin4 and unclogs your pores, too, but it is quite strong. You’ll only be able to find this in strengths around 2%, but it can still dry and irritate your skin, especially if yours is sensitive. The safest way to use this ingredient is according to the directions!
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]
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]

Combined oral contraceptive pills contain progesterone and estrogen and help to balance out the levels of testosterone in the body12 One obvious effect of this is birth control, but dermatologists have also found it very useful for treating hormonal acne. Testosterone doesn’t directly cause acne, but when hormone levels fluctuate and testosterone increases above its baseline level, it can lead to increased acne for some. This is because increases in testosterone and other androgens leads to an increase in sebum production, which can cause more clogged pores and more p. acnes bacteria, leading to blackheads, whiteheads, pimples, or even cysts.


“Acne cleansers with these ingredients will gradually unclog pores, reduce the size of existing blackheads and slow or stop the formation of new ones,” she says. “Benzoyl peroxide is also the best ingredient for treating the acne-causing bacteria called p. acnes. In fact, study after study continues to show that benzoyl peroxide is more effective than prescription topical antibiotics at treating p. acnes.”
Salicylic Acid – One of the most common topical ingredients you can find over-the-counter, salicylic acid is generally used to reduce the appearance of acne, by reducing swelling and redness. Also known as a beta-hydroxy acid, it exfoliates your skin4 and unclogs your pores, too, but it is quite strong. You’ll only be able to find this in strengths around 2%, but it can still dry and irritate your skin, especially if yours is sensitive. The safest way to use this ingredient is according to the directions!

The side effects depend on the type of treatment you use. Generally, for topical, over-the-counter creams, you can watch out for stinging, redness, irritation and peeling — these side effects usually don’t go any deeper than the skin. Others, like oral antibiotics or hormonal medications, could come with new sets of complications, so we suggest talking to your doctor before pursuing the treatment.

Sodium sulfacetamide-sulfur is another acne medications often found in over-the-counter treatments, and it works especially well for those with mild-moderate acne that is largely made up of pimples. This is because it effectively dries out excess sebum without drying out the skin, and some studies suggest that this combination of sodium sulfacetamide and sulfur has antibacterial properties. According to one study published in The Journal of Clinical and Aesthetic Dermatology, sodium sulfacetamide 10 percent-sulfur 5 percent can significantly reduce the size of p. acnes colonies when used as an emollient foam6. This treatment option is also available as a facewash, topical gel, and topical cream, and can be found at most drugstores.
Acne is caused when the sebaceous glands in your skin get infected or inflamed. Blemishes and pimples are most commonly found on your face, chest and back. You have a system of oil glands under your skin, and this is where sebum is produced. Sebum is supposed to keep your skin healthily moisturized, but too much production of this oil can cause blackheads and whiteheads. When the oil is pushed out through your hair follicles, it can clog your pores if it attaches to bacteria or dead skin cells. If this happens, sebum will build up behind the plug and form a pimple. And we all know what that is.

While you can certainly benefit from a great skin-care regimen, "in cystic acne, usually you need internal treatment," he says. "Topical medications usually don't work. Accutane is a great miracle cure for really bad cystic acne, but most people with cystic acne will improve with oral antibiotics — sometimes for two weeks, sometimes for three weeks."


Postinflammatory hyperpigmentation (PIH) is usually the result of nodular acne lesions. These lesions often leave behind an inflamed darkened mark after the original acne lesion has resolved. This inflammation stimulates specialized pigment-producing skin cells (known as melanocytes) to produce more melanin pigment which leads to the skin's darkened appearance.[34] People with darker skin color are more frequently affected by this condition.[35] Pigmented scar is a common term used for PIH, but is misleading as it suggests the color change is permanent. Often, PIH can be prevented by avoiding any aggravation of the nodule, and can fade with time. However, untreated PIH can last for months, years, or even be permanent if deeper layers of skin are affected.[36] Even minimal skin exposure to the sun's ultraviolet rays can sustain hyperpigmentation.[34] Daily use of SPF 15 or higher sunscreen can minimize such a risk.[36]
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