Which of the following is a common treatment for acne?

Oral antibiotics are a common treatment for acne because they help reduce the bacteria on the skin that can contribute to acne formation and inflammation. These medications work by targeting the bacteria that can cause acne flare-ups and reducing the overall inflammatory response. Additionally, oral antibiotics can help regulate oil production in the skin, which is another factor that can lead to acne development.

In contrast, while surgical intervention may be considered for certain cases of severe acne or scarring, it is not a standard treatment for acne itself. Moisturizers, although they can be beneficial for maintaining skin hydration, do not treat the underlying causes of acne. Hydrotherapy is typically not recognized as a primary treatment for acne; instead, it generally refers to treatments using water for various therapeutic purposes but does not directly address acne. Thus, oral antibiotics are the most appropriate and commonly used option among the treatments listed for managing acne.