I fell of my bike 2.5 months ago and had a bad scrape on my left knee. For the first 30 days, I put on Vaseline and a new bandaid each day after a shower. For days 31-75, I kept a Scaraway silicone sheet on the site for nearly 24 hours a day, but it looks like a scar is still forming. My body tends to form dark scars easily and I have some at other locations. How can I prevent or treat the scar on my knee?