Benzoyl peroxide attacks the P. acnes bacteria. However, one of its main side effects is dryness: If you’re going to use anything with benzoyl peroxide, make sure to moisturize afterwards. Sulfur and azelaic acid are less common and less severe alternatives to benzoyl peroxide. Dr. Peter Lio, assistant professor of clinical dermatology at Northwestern University, says sulfur-based treatments are “a good fit for patients who can’t tolerate the side effects of benzoyl peroxide.”
There has been a long-observed link between higher stress levels and the incidence of breakouts, and studies have shown that stress can worsen acne’s frequency and severity. Sebaceous glands contain receptors for stress hormones, making them upregulated and kicking sebum production into overdrive. Unfortunately, those with stress sometimes fall victim to a vicious acne cycle. Anxious types have a tendency to pick their skin and pop pimples under stress. This bad habit can exacerbate blemishes by pushing the buildup deeper into the pore, inducing cellular damage, rupturing cellular walls, and spreading bacteria. In extreme cases, sometimes people become so worried or embarrassed about their skin that they compulsively pick at every little thing that shows up. This condition is called acne excoriee, and can turn mild acne into severe scars.
Diet. Studies indicate that certain dietary factors, including skim milk and carbohydrate-rich foods — such as bread, bagels and chips — may worsen acne. Chocolate has long been suspected of making acne worse. A small study of 14 men with acne showed that eating chocolate was related to a worsening of symptoms. Further study is needed to examine why this happens and whether people with acne would benefit from following specific dietary restrictions.