Blue light rays penetrate follicles to kill off acne-causing bacteria. For severe cases, photodynamic therapy adds a topical solution called Levulan to blue light therapy. Note that these treatments can cause temporary redness and may not be covered by insurance. Prices vary greatly depending on the location and severity of acne, but can cost at least $50 for one blue light treatment and $100 or more per photodynamic therapy session. Most patients will need multiple treatments to see effective results, but many dermatologists offer package deals.
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 P. acnes by oxidizing its proteins through the formation of oxygen free radicals and benzoic acid. These free radicals are thought to interfere with the bacterium's metabolism and ability to make proteins. Additionally, benzoyl peroxide is mildly effective at breaking down comedones and inhibiting inflammation. Benzoyl peroxide may be paired with a topical antibiotic or retinoid such as benzoyl peroxide/clindamycin and benzoyl peroxide/adapalene, respectively.
Any acne treatment is a weeks-long experiment that you’re conducting with your skin. Acne is slow to heal, and in some cases, it can get worse before it gets better (nearly every benzoyl peroxide product we looked at emphasized the likeliness of irritating acne further, and starting off with a lighter application). April W. Armstrong, a doctor at the University of California Davis Health System, recommends waiting at least one month before you deem a product ineffective.
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