If the skin scraped is very thin (about one to two mm), usually in 3-6 months time, the skin pigmentation comes to normal tone and scar is quite invisible. In these case one needs to do nothing and a normal healing process is good enough to take care of it. If the skin is scraped more than this thickness, scarring can be visible and may take lighter or darker tone. Any ointment at this point of time would not matter much in whole of the process of color and only after three months of the complete healing any thing need to be done (like laser procedure or any plastic surgical procedure), if necessary.
Please feel free for your follow up questions.