What is the best treatment for hypertrophic scars, is it best to use silicone sheets or silicone gel. or is it possible to use both?

Scars: Silicone sheets and gels can be very helpful but usually you need to be consistent and the usually time frame is three months. No need to use both just one or the other. However, it is not perfect and if there is not adequate resolution of the scar, you may need to seek consultation with a plastic surgeon or dermatologist. Hope that helps.