Both salicylic acid and benzoyl acid are commonly found in the top acne treatments for getting rid of mild to severe acne. They work in tandem to getting rid of the dead skin and killing bacteria, which are two of the main contributors to the spread of acne. Salicylic acid breaks up the skin to clear pores from skin, oil and bacteria and benzoyl peroxide kills the bacteria slowly over a 48-hour period.
Even though it may be convenient to wash your face with whatever you have in your bathroom, there are a lot of reasons why you want to avoid that like the plague. Summed up in one word, those reasons are; ingredients. Because different people have different skin types, not all ingredients will work the same for everybody, but the general principle remains the same.

^ Jump up to: a b c Zaenglein, AL; Graber, EM; Thiboutot, DM (2012). "Chapter 80 Acne Vulgaris and Acneiform Eruptions". In Goldsmith, Lowell A.; Katz, Stephen I.; Gilchrest, Barbara A.; Paller, Amy S.; Lefell, David J.; Wolff, Klaus (eds.). Fitzpatrick's Dermatology in General Medicine (8th ed.). New York: McGraw-Hill. pp. 897–917. ISBN 978-0-07-171755-7.
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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.
“You unfortunately cannot determine the strength of a product strictly by the percentage of its active ingredients because how well a product works depends on how well its inactive ingredients help it penetrate the skin,” explains Dr. Green. “In other words, a 2 percent benzoyl peroxide may be more effective than another brand’s 5 percent benzoyl peroxide because there are other ingredients helping out.”
Light therapy is a treatment method that involves delivering certain specific wavelengths of light to an area of skin affected by acne. Both regular and laser light have been used. When regular light is used immediately following the application of a sensitizing substance to the skin such as aminolevulinic acid or methyl aminolevulinate, the treatment is referred to as photodynamic therapy (PDT).[10][129] PDT has the most supporting evidence of all light therapies.[78] Many different types of nonablative lasers (i.e., lasers that do not vaporize the top layer of the skin but rather induce a physiologic response in the skin from the light) have been used to treat acne, including those that use infrared wavelengths of light. Ablative lasers (such as CO2 and fractional types) have also been used to treat active acne and its scars. When ablative lasers are used, the treatment is often referred to as laser resurfacing because, as mentioned previously, the entire upper layers of the skin are vaporized.[140] Ablative lasers are associated with higher rates of adverse effects compared with nonablative lasers, with examples being postinflammatory hyperpigmentation, persistent facial redness, and persistent pain.[8][141][142] Physiologically, certain wavelengths of light, used with or without accompanying topical chemicals, are thought to kill bacteria and decrease the size and activity of the glands that produce sebum.[129] As of 2012, evidence for various light therapies was insufficient to recommend them for routine use.[8] Disadvantages of light therapy can include its cost, the need for multiple visits, time required to complete the procedure(s), and pain associated with some of the treatment modalities.[10] Various light therapies appear to provide a short-term benefit, but data for long-term outcomes, and for outcomes in those with severe acne, are sparse;[76][143] it may have a role for individuals whose acne has been resistant to topical medications.[10] A 2016 meta-analysis was unable to conclude whether light therapies were more beneficial than placebo or no treatment, nor how long potential benefits lasted.[144] Typical side effects include skin peeling, temporary reddening of the skin, swelling, and postinflammatory hyperpigmentation.[10]
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.

If your acne is severe, painful, or refusing to get lost, you may just be beyond what an over-the-counter treatment can do. Not only can a professional set you up with the really powerful stuff, but also Fitz Patrick explains that “working closely with an aesthetician or dermatologist means you can keep tweaking a routine to make it work best for you.”

Acne vulgaris Acne conglobata Acne miliaris necrotica Tropical acne Infantile acne/Neonatal acne Excoriated acne Acne fulminans Acne medicamentosa (e.g., steroid acne) Halogen acne Iododerma Bromoderma Chloracne Oil acne Tar acne Acne cosmetica Occupational acne Acne aestivalis Acne keloidalis nuchae Acne mechanica Acne with facial edema Pomade acne Acne necrotica Blackhead Lupus miliaris disseminatus faciei
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