When you start a retinol, the bumps that surface over the first several weeks usually aren't brand-new acne — retinol speeds up cell turnover and pushes clogs that were already forming to the surface faster. Cleveland Clinic notes pimples may still appear during the first couple of months, and skin “might even look worse” before it clears. What is not purging: spreading rash, swelling, hives, or bumps in places you've never broken out.

AAD states plainly that retinoids can make skin more sensitive to the sun — which is exactly why AAD says to use them only at night and to always use sun protection during the day. Skipping daytime SPF isn't just a sunburn risk: UV exposure drives the same pigmentation, dullness, and fine lines most people bought retinol to address, undoing your own progress.

Retinol plus benzoyl peroxide plus a glycolic toner plus a salicylic acid cleanser isn't four times the results — it's four irritants stacked on one face. AAD lists drying out your skin as a habit that worsens acne, because irritated skin risks more acne. A product needs 6 to 8 weeks to show improvement, and complete clearing generally takes 3 to 4 months.

Per AAD, salicylic acid opens clogged pores and exfoliates the skin, effective for whiteheads and pimples. Benzoyl peroxide reduces acne-causing bacteria on the skin. In plain terms: salicylic acid works on the plug, benzoyl peroxide works on the bacterial and inflammatory side. Grabbing whichever bottle is on sale ignores which part of the process your breakouts are stuck on.

FDA states that higher SPF values provide greater sunburn protection only “up to 50.” FDA also corrects the biggest SPF misconception: SPF relates to amount of solar exposure, not time — so SPF 15 does not buy you 15 hours. Directions are the same regardless of the number: apply 15 minutes before exposure, use about one ounce for the whole body, and reapply at least every two hours.