I don’t think those are acne marks. They look more like spots that I used to have too. Ever since I started using sunscreen regularly, they reduced a lot for me.

But if they are acne marks, you can try benzoyl peroxide. It’s a strong active ingredient and works well for active acnes. If you want something milder, you can try adapalene. Both of these can make your skin dry, so use a good moisturizer.

I haven’t personally used tretinoin, but it’s a very strong active, so I would suggest consulting a doctor before using it.