DeDe, best bet is to see your GP and get them to take a look at it. They may order an Ultrasound to check for fluid behind the wound site.

If there's some residual infection or another problem, that will obviously have to be treated. If however it's scar or healed in an unsightly manner, you may need to wait awhile to see how it develops. It could go down over time. If not, you could pursue plastic surgery at a later date to have that tissue removed and the wound 'tidied up'.