Re: red marks
50-100mgs its tolerable by most of zinc. I took 50mg pills (333%) and had no bad side effects, it sped up the healing of my face. As for redmarks, you just have to wait them out. My derm said time is really all that fades em. Chemical peels and microdermabrasion can help a little, but maybe only a little. As for zinc and redmarks...you won't notice anything. Zinc is good for pimples, as the life of them are a lot shorter, and healing is a lot faster.
Red marks will be minimal as long as you don't pop the pimple. Whiteheads are nasty, but they last only a week or more. Redmarks from popping them last 4-5+ months....you make the decision.