Scar management nurses recommended to my wife to massage the scar area with bio-oil and a silicone based gel which you can purchase from your nearest pharmacy.

both have done wonders and works a treat. the tip is to make sure that the scar tissue dosent go hard but remains soft.

6/8/12: Wife 33y/o with no risk dx with Stage IVa SCC L of Tongue(T4aN2bM0)
3/9/12: Induced birth @ 36 weeks - Baby Hunter!
11/9/12: OP - 3/4 Partial Gloss, Radical ND & Tongue Rec.
24/10/12: 33xRad + 7xChemo
7/12/12: Tx complete
21/3/13 & 21/6/13: NED
24/7/13: SCC in Lungs - OP: Lobectomy (VATS)
29/1/14 passed away