What can I do with this huge leg scar? (photos)

I got this scar from using Erase an oil here in thr Philippines said to remove scars. 2014 i had a small burn about two inches. So i started using erase it contain tretinoin. But it got so worse than ever. It kunda burnt my leg the solution spread and caused me to have this scar. Now i never wear dresses or shorts even if it's really hot in my country. Also i have very light skin the scar is like two shades darker than my skin. I tried dermatix. hydrocortisone it didn't work. What should i do?