I have fresh acne marks - would a Clindamycin 1% + Niacinamide 4% gel help? (use Cream instead if master form is Cream)

This combination is more focused on treating active acne and reducing inflammation than on fading marks directly, though niacinamide does help calm redness and even out tone over time. Fresh marks especially tend to fade on their own over a few months, and this can support that process alongside sun protection. If the marks are stubborn or dark, ask your dermatologist whether you need something added specifically for pigmentation.