Meanwhile, salicylic acid, which is derived from willow tree bark, wintergreen oil or sweet birch and occurs naturally in fruits like raspberries, cantaloupe and granny smith apples, works well for most skin types. Aside from being an exfoliant that sloughs away dead skin cells and other pore-clogging impurities, it has anti-inflammatory properties that help to address inflammation, which is thought to be the primary cause of acne.
Acne medications work by reducing oil production, speeding up skin cell turnover, fighting bacterial infection or reducing inflammation — which helps prevent scarring. With most prescription acne drugs, you may not see results for four to eight weeks, and your skin may get worse before it gets better. It can take many months or years for your acne to clear up completely.