How consistently do I need to apply acne scar ointment for it to be effective?

I always get one big pimple around the time of my period.

Even if I don't squeeze it and just leave it alone, it always ends up leaving a scar.

I wouldn't feel so wronged if I had just planned it out, but I'm so upset.

My skin is on the fairer side, so it shows really well, and every month when I think about having my period, it looks patchy.

I saw on YouTube that Noscarna Gel from the pharmacy was good, so I've been applying it consistently, but honestly, I don't really see the scars disappearing.

How much should I apply to see some effect?