Will silicone gel help with a depressed scar?

I recently acquired a somewhat depressed rolling scar from a mole removal. It's been about a month and the scar is still fairly red. My derm told me to apply Biocorneum silicone gel to it, however, I've read it's not effective on depressed/atrophic scars. Is this correct? What else can I apply to help with the redness/depression?