Points to consider:
1. It can take longer than 2 years for a scar to begin to "settle" back into the surrounding skin, but;
2. If you are prone to keloid formation, then this scar may be troublesome, and in some cases the scar tissue even enlarges (I'm NOT saying yours is doing this, because I have no idea that it is).
So...make an appointment with a physician, go in with the question concerning whether or not you are looking at a keloid. His opinion will have merit.
Relevance to this forum: there is some :D. Many restorers, myself included, have found that putting tension on shaft skin, time after time, seems to break down the circ scar, make it sort of fade into the shaft skin. So, you can consider this as a possible fix to your problem but only AFTER having the doctor tell you it's not a keloid.