S.S.
Mederma.
It's not that expensive - and a $12 tube should last a couple of months. I used it on my son's face after he lost a fight with a rose bush - he had one particularly nasty gash down his left cheek and my husband called him scarface for 6 months, and toward the end people wanted to know what he was talking about - there was no scar left.
My other son got two gashes in his chest from the staples on a friend's couch. As an experiment, I used mederma on one - he only has one scar (from the non mederma site). I feel guilty now, so I'm using mederma on that one.
S.