Which of the following is a common treatment modality for acne?

Blue light therapy is commonly used as a treatment modality for acne due to its effectiveness in targeting the bacteria (Propionibacterium acnes) that contribute to acne development. The light emitted at specific wavelengths penetrates the skin and produces a reaction that destroys these bacteria, thereby reducing inflammation and the severity of outbreaks. This method is non-invasive and often used in combination with other treatments for enhanced results.

The other modalities listed may also have roles in acne treatment but do not specifically target the bacterial causes of acne in the same way as blue light therapy. For example, cryotherapy involves the use of extreme cold to treat various skin conditions but is not primarily focused on acne. Microdermabrasion promotes the exfoliation of dead skin cells, which can help improve skin texture and promote cell turnover, yet it does not directly kill bacteria. Chemical peels can also aid in the treatment of acne by clearing pores and reducing oiliness, but they function differently by chemically exfoliating the skin rather than utilizing light therapy.