My advice; you don't want to go too dark or dense on the raised areas with SMP - reason being, when the application settles, if the pigment was too dark or liberally concentrated to the specific area, it's gonna be much more noticeable. Your practitioner will be able to offer a reasonable suggestion/approach to camo'ing the scar(s) to give you the best results (withstanding)
I have a childhood raised scar that had never been a problem till much later on in life. My practitioner was able to do a fantastic job at minimizing the scar's appearance and creating a look that totally compliments the entire scalp.
As with anything.... Due Diligence, research and don't be afraid to ask questions.
just my two cents