Treating pigmentation can take time, and requires consistent use of your Software formula as well as patience.
Because pigmentation lies within the deeper layers of the skin, to fade darker areas your skin needs to undergo multiple skin cell cycles (where new skin cells move up to the surface to replace old skin cells) and it can take up to 6 months to see improvement.
Sun exposure can heavily influence development of pigmentation so the most effective thing you can do to prevent worsening of pigmentation is to wear sunscreen every day and stay out of the sun as much as possible.