To remove you can benefit from chemical peels, TCA peels, Fraxel laser and to prevent no picking, a good sunblock with titanium and zinc oxide and a consistent acne regimen.
The red marks from acne should heal on their own but it can take months. You need to get your acne under control so you stop getting new marks. Pulsed dye laser, Isolaz, intense pulsed light, and chemical peels can often reduce the scarring faster. See a great board certified dermatologist for expert help.