Steroid Injections for Hard Lump Scar on the Forehead?

A year ago (July 2008), my head was lacerated while wakeboarding. It left a 2 cm scar on my forehead above my right eye. Since it has healed and the stitches were removed about a week after, I developed a hard lump under the scar that feels like it's down in the muscle. Would steroid injections be an option for me or some other type of scar revision? Or is it too late? Should I have taken more steps after the initial injury? I did use Mederma religiously and it has healed very smooth on the surface. I also occasionally used heat and ice mainly for the pain. Thank you!