What Can I Do to Minimize Scarring on Forehead of a Toddler?

My 3 1/2 yr old sliced his forehead open an inch, his scull was exposed. It's been 4 weeks. They used absorbable sutures, but it appeared they only sutured from mid depth of the cut up thru the top layer of the skin rather than sewing up each layer of muscle. It looked like a "butterfly" or figure 8 like stitch. He got 7 stitches. It is red, looks indented where cut is healing. And one end is bumpy to the touch, and there are stitch marks. Is this normal? What can I do to minimize scar?silicone?