@Delfia fanHi there, ... I don't see any scars in your above pictures, ... they are PIE or redness / wounding post acne. It takes some people up to a year to heal from this. Your 16 so I don't want to offer to many treatments as you can heal naturally. You can always see a dermatologist to take care of this quicker with a laser or topical. I would start with a retinoid, vitamin c serum also helps, niacinamide, and or glycolic peels. Wounds take time to heal, you don't want to rush the process. Sunscreen n is a must. I also see some hyperpigmentaiton PIH which could use a skin lightener cream with something like licorice, konjic acid, arbutin, etc are helpful.