Post-acne scars

The marks left after a spot are not all scars. Red ones are inflammation that fades on its own within a few months. Brown ones are a melanin deposit, and there a brightening product clearly speeds things up. Indented ones are a dermatologist's job.

For red marks: snail mucin, centella, PDRN, which speed up repair. For brown ones: alpha-arbutin, tranexamic acid, niacinamide.

In both cases daily sunscreen is non-negotiable: the sun fixes the marks and doubles how long they last.