Many different treatments exist for acne. These include alpha hydroxy acid, anti-androgen medications, antibiotics, antiseborrheic medications, azelaic acid, benzoyl peroxide, hormonal treatments, keratolytic soaps, nicotinamide, retinoids, and salicylic acid. Acne treatments work in at least four different ways, including the following: reducing inflammation, hormonal manipulation, killing C. acnes, and normalizing skin cell shedding and sebum production in the pore to prevent blockage. Typical treatments include topical therapies such as antibiotics, benzoyl peroxide, and retinoids, and systemic therapies, including antibiotics, hormonal agents, and oral retinoids. Recommended therapies for first-line use in acne vulgaris treatment include topical retinoids, benzoyl peroxide, and topical or oral antibiotics. Procedures such as light therapy and laser therapy are not first-line treatments and typically have only an add on role due to their high cost and limited evidence. Blue light therapy is of unclear benefit. Medications for acne target the early stages of comedo formation and are generally ineffective for visible skin lesions; acne generally improves between eight and twelve weeks after starting therapy. Skin care In general, it is recommended that people with acne do not wash affected skin more than twice daily. The application of a fragrance-free moisturizer to sensitive and acne-prone skin may reduce irritation. Skin irritation from acne medications typically peaks at two weeks after onset of use and tends to improve with continued use. Dermatologists recommend using cosmetic products that specifically say non-comedogenic, oil-free, and won't clog pores. Acne vulgaris patients, even those with oily skin, should moisturize in order to support the skins moisture barrier since skin barrier dysfunction may contribute to acne. Moisturizers, especially ceramide-containing moisturizers, as an adjunct therapy are particularly helpful for the dry skin and irritation that commonly results from topical acne treatment. Studies show that ceramide-containing moisturizers are important for optimal skin care; they enhance acne therapy adherence and complement existing acne therapies. In a study where acne patients used 1.2% clindamycin phosphate / 2.5% benzoyl peroxide gel in the morning and applied a micronized 0.05% tretinoin gel in the evening the overwhelming majority of patients experienced no cutaneous adverse events throughout the study. It was concluded that using ceramide cleanser and ceramide moisturizing cream caused the favorable tolerability, did not interfere with the treatment efficacy, and improved adherence to the regimen. The importance of preserving the acidic mantle and its barrier functions is widely accepted in the scientific community. Thus, maintaining a pH in the range 4.5 - 5.5 is essential in order to keep the skin surface in its optimal, healthy conditions. Diet Causal relationship is rarely observed with diet/nutrition and dermatologic conditions. Rather, associations — some of them compelling — have been found between diet and outcomes including disease severity and the number of conditions experienced by a patient. Evidence is emerging in support of medical nutrition therapy as a way of reducing the severity and incidence of dermatologic diseases, including acne. Researchers observed a link between high glycemic index diets and acne. Dermatologists also recommend a diet low in simple sugars as a method of improving acne. As of 2014, the available evidence is insufficient to use milk restriction for this purpose. Medications Benzoyl peroxide alt=A tube of benzoyl peroxide gel 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 C. acnes by oxidizing its proteins through the formation of oxygen free radicals and benzoic acid. These free radicals likely interfere with the bacterium's metabolism and ability to make proteins. Additionally, benzoyl peroxide is mildly effective at breaking down comedones and inhibiting inflammation. Combination products use benzoyl peroxide with a topical antibiotic or retinoid, such as benzoyl peroxide/clindamycin and benzoyl peroxide/adapalene, respectively. Topical benzoyl peroxide is effective at treating acne. Side effects include increased skin photosensitivity, dryness, redness, and occasional peeling. Sunscreen use is often advised during treatment, to prevent sunburn. Lower concentrations of benzoyl peroxide are just as effective as higher concentrations in treating acne but are associated with fewer side effects. Unlike antibiotics, benzoyl peroxide does not appear to generate bacterial antibiotic resistance. Retinoids Retinoids are medications that reduce inflammation, normalize the follicle cell life cycle, and reduce sebum production. They are structurally related to vitamin A. Studies show dermatologists and primary care doctors underprescribe them for acne. The retinoids appear to influence the cell life cycle in the follicle lining. This helps prevent the accumulation of skin cells within the hair follicle that can create a blockage. They are a first-line acne treatment, especially for people with dark-colored skin. Retinoids are known to lead to faster improvement of postinflammatory hyperpigmentation. Topical retinoids include adapalene, retinol, retinaldehyde, isotretinoin, tazarotene, trifarotene, and tretinoin. They often cause an initial flare-up of acne and facial flushing and can cause significant skin irritation. Generally speaking, retinoids increase the skin's sensitivity to sunlight and are therefore recommended for use at night. Tretinoin is the least expensive of the topical retinoids and is the most irritating to the skin, whereas adapalene is the least irritating but costs significantly more. Most formulations of tretinoin are incompatible for use with benzoyl peroxide. Tazarotene is the most effective and expensive topical retinoid but is usually not as well tolerated. In 2019 a tazarotene lotion formulation, marketed to be a less irritating option, was approved by the FDA. Retinol is a form of vitamin A that has similar but milder effects and is present in many over-the-counter moisturizers and other topical products. Isotretinoin is an oral retinoid that is very effective for severe nodular acne, and moderate acne that is stubborn to other treatments. One to two months of use is typically adequate to see improvement. Acne often resolves completely or is much milder after a 4–6 month course of oral isotretinoin. After a single round of treatment, about 80% of people report an improvement, with more than 50% reporting complete remission. About 20% of people require a second course, but 80% of those report improvement, resulting in a cumulative 96% efficacy rate. There are concerns that isotretinoin is linked to adverse effects, like depression, suicidality, and anemia. There is no clear evidence to support some of these claims. Isotretinoin has been found in some studies to be superior to antibiotics or placebo in reducing acne lesions. However, a 2018 review comparing inflammatory lesions after treatment with antibiotics or isotretinoin found no difference. The frequency of adverse events was about twice as high with isotretinoin use, although these were mostly dryness-related events. No increased risk of suicide or depression was conclusively found. Medical authorities strictly regulate isotretinoin use in women of childbearing age due to its known harmful effects in pregnancy. 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. In 2008, the United States started the iPLEDGE program to prevent isotretinoin use during pregnancy. iPledge requires the woman to have two negative pregnancy tests and to use two types of birth control for at least one month before isotretinoin therapy begins and one month afterward. The effectiveness of the iPledge program is controversial due to continued instances of contraception nonadherence. Antibiotics People may apply antibiotics to the skin or take them orally to treat acne. They work by killing C. acnes and reducing inflammation. Although multiple guidelines call for healthcare providers to reduce the rates of prescribed oral antibiotics, many providers do not follow this guidance. Oral antibiotics remain the most commonly prescribed systemic therapy for acne. Widespread broad-spectrum antibiotic overuse for acne has led to higher rates of antibiotic-resistant C. acnes strains worldwide, especially to the commonly used tetracycline (e.g., doxycycline) and macrolide antibiotics (e.g., topical erythromycin). Therefore, dermatologists prefer antibiotics as part of combination therapy and not for use alone. Commonly used antibiotics, either applied to the skin or taken orally, include clindamycin, erythromycin, metronidazole, sulfacetamide, and tetracyclines (e.g., doxycycline or minocycline). Doxycycline 40 milligrams daily (low-dose) appears to have similar efficacy to 100 milligrams daily and has fewer gastrointestinal side effects. However, low-dose doxycycline is not FDA-approved for the treatment of acne. Antibiotics applied to the skin are typically used for mild to moderately severe acne. Oral antibiotics are generally more effective than topical antibiotics and produce faster resolution of inflammatory acne lesions than topical applications. Topical and oral antibiotics are not recommended for use together. Oral antibiotics are recommended for no longer than three months as antibiotic courses exceeding this duration are associated with the development of antibiotic resistance and show no clear benefit over shorter durations. If long-term oral antibiotics beyond three months are used, then it is recommended that benzoyl peroxide or a retinoid be used at the same time to limit the risk of C. acnes developing antibiotic resistance. The antibiotic dapsone is effective against inflammatory acne when applied to the skin. It is generally not a first-line choice due to its higher cost and a lack of clear superiority over other antibiotics. Topical
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