Acne affects 85% of teenagers but can frequently persist into adulthood. It causes significant physical and psychological effects for patients including facial scarring, depression, and decreased self-esteem. The initial approach to acne is determined according to presenting severity, emphasizing topical treatment for milder disease and the addition of oral therapy as disease becomes more severe.
Treatment of mild acne can begin with either benzoyl peroxide (BP) or a topical retinoid (TR). Another option for slightly more severe acne is to start with the initially suggested treatment for moderately severe acne, which is topical combination therapy with BP plus a topical antibiotic; TR plus BP; or TR plus BP in combination with a topical antibiotic. Combination therapy can be given either with separate application of the different medicines or by using fixed combination products that include the separate components in one formulation.
BP is an antibacterial agent, with mild comedolytic properties, and it often is added to topical antibiotic therapy to increase effectiveness and reduce the development of resistance. BP is available in strengths from 2.5% to 10% and in a variety of formulations, which can be used as leave-on or wash-off agents. Common side effects include dose dependent skin irritation and bleaching of fabric.
Topical antibiotics, including clindamycin and erythromycin, work through both their antimicrobial and anti-inflammatory affects. Monotherapy with topical antibiotics is no longer recommended; instead they should be used in combination with BP to prevent bacterial resistance. The preferred topical antibiotic is clindamycin 1% solution or gel. Clindamycin is available in a combination with BP, which may enhance compliance with the treatment regimen.
Topical retinoids are vitamin A derivatives that are the core of treatment. They are effective for all forms of acne and should always be used in the treatment of comedonal acne. There are currently three active agents available: tretinoin (0.025%-0.1% in cream, gel, or microsphere gel vehicles), adapalene (0.1% and 0.3% cream or 0.1% lotion), and tazarotene (0.05% and 0.1% cream, gel, or foam). Combination products are available containing clindamycin and BP. The main side effects of retinoids include dryness, peeling, erythema, and skin irritation. Reducing the frequency of application or potency used may be helpful for limiting these side effects. Topical retinoids increase the risk of photosensitivity, so patients should be counseled on daily sunscreen use, and their use is contraindicated in pregnancy.
Dapsone is an alternative topical treatment for mild acne. Topical dapsone is primarily effective in reducing inflammatory lesions, and seems to be more beneficial for female patients. Dapsone can be combined with topical retinoids if comedonal lesions are present.
Moderate acne can be treated with either topical combination therapy as described above, or systemic antibiotics plus a TR and BP, with or without the addition of a topical antibiotic as well. Female patients may also consider combined oral contraceptives or spironolactone for the treatment of moderate acne.
Systemic antibiotics have been used in the treatment of acne vulgaris for many years, and they are indicated for use in moderate to severe acne. They should always be used in combination with topical therapies, specifically a retinoid or BP. Generally, systemic antibiotics should be used for the shortest possible duration, often 3 months, to prevent the development of bacterial resistance. Tetracyclines and macrolides have the strongest evidence for efficacy. Doxycycline and minocycline are considered equally effective and are the preferred first-line oral antibiotics. Azithromycin has been studied in a variety of pulse dose regimens, and is a good alternative for patients who are not candidates for tetracyclines.
Combined oral contraceptive pills (COCs) are another option for the treatment of acne in female patients. COCs improve acne through their antiandrogenic effects. Spironolactone also has antiandrogen properties, and while it is not FDA approved for the treatment of acne, the AAD guidelines support selective use in women. Spironolactone has been studied at doses from 50 to 200 mg daily and has shown clinically significant improvement in acne. Side effects include diuresis, menstrual irregularities, breast tenderness, and rare hyperkalemia.
Severe acne is treated with an oral antibiotic plus topical combination therapy, or oral isotretinoin, with the addition where appropriate of COCs or oral spironolactone.
Oral isotretinoin, an isomer of retinoic acid, is approved by the FDA for the treatment of severe recalcitrant acne. It causes decreased sebum production, acne lesions, and scarring. It can also be considered in the treatment of moderate acne that is resistant to other treatments, relapses quickly, or produces significant scarring or psychosocial distress. Serum cholesterol, triglycerides, and transaminases can rise during treatment, and should be monitored. Because of the risk of teratogenic effects, the FDA has mandated that all patients receiving isotretinoin must participate in the iPLEDGE risk management program, which requires abstinence or two forms of birth control. While isotretinoin requires monitoring and carries the possibility of significant side effects, it is an effective treatment option for patients with severe recalcitrant acne.