Any Possible Revisions for Hypertrophic Scar After Piercing?

Form of body modification known as microdermal or surface anchor (not to be confused with surface piercing) Piercing had gotten badly infected then rejected completely from skin Left deep red scar, slightly raised then flattened after 2-3 weeks Still was very red in color What can be done to reduce the red/purple pigment in the scarred skin? Piercing was on my chest