What is the best course of treatment to remove scar tissue from underneath the skin without causing further scarring?

Roughly 3 years ago i had an accident on my bicycle where i hit my forehead and was knocked out. Ever since then i have had a small bump (2 centimeters in diameter) on my forehead between my eyebrows. I have been to see a dermatologist who suggested having a steroid injection but said if i did it was likely to leave a crater on my forehead. Obviously i don't want that to happen. Is there anything else i can do?

No doctor answers yet