I would like a mild acne treatment that heals red post acne marks?

Mild will fail: The red marks after acne lesions subside aren't treatable and you'll need to let them face on their own. Instead, focus on whatever it takes to keep your disease under control -- and if it's leaving red marks that stay around, you'll need strong stuff. If topical benzoyl peroxide as tolerated isn't clearing you in 2 weeks, you'll need prescription-strength from your physician.