How Does Kenalog Work? Does It Actually Destroy Collagen?

I developed hypertrophic inframammary scars from bilateral breast lift. Kenalog was injected a few times, but my scars did not respond to treatment as desired. My skin turned maroon/deep purplish color and became very shiny. After color finally returned, the scars were still hard, red, itchy and raised. Is surgical scar revision the only option now? Silicone sheeting, silicone gel and deep massaging for the past 5 months have all failed. I'm biracial. I don't smoke and don't sunbathe.