I had one back in 2001, its still raised, but I think I scar like that, I think its called keloid scarring?? where the scar is raised and shiny, red.
My c section scar is half like that and half smooth, very annoying! the scar in my belly button is the same too.
There is a product available from pharmacies, for the life of me I cant remember the name of it, but its a small tube around $70 for scars, recommended by plastic surgeons, did a training on it once, customers really liked it.