According to WebMD, the best type of soap for acne-prone skin is soap that is alcohol-free and nonabrasive. Certain types of soap contain additional ingredients that help fight acne. For example, medicated soaps often contain salicylic acid and benzoyl peroxide, which both help treat acne.
Soaps that contain emollients are also good for acne-prone skin because they help cleanse the skin without drying it out. Soaps made with tea tree oil are also ideal for treating acne. Tea tree oil is a natural cleanser and helps get rid of bacteria found on the skin. Tea tree oil can also help alleviate inflammation caused by acne.