What procedure to remove scar at top of nose?
The scar at the top of your nose does appear wide, depressed and lighter in color than the rest of your skin. I would recommend a scar revision to remove the scar and ideally replace it with a thin, flat scar that would be less noticeable than the one you currently have.
What procedure(s) would remove this scar?
There is no way to definitively and permanently remove scars--that is the biologic way that the human body heals. Often however, a dermatologist or plastic surgeon with experience treating scars can help to diminish their appearance typically using a combination of approaches. Sometimes fractional laser treatments can improve the appearance of scars and make them less noticeable. It is a little hard to tell from this photo but it does appear that your scar is slightly wide and hypopigmented. You very well may benefit from a scar revision where the old scar is cut out and a new, nicer scar is made followed by an aggressive scar care program afterwards (taping, sun avoidance, scar massage, and laser treatments). A plastic surgeon can definitely help you with that but make sure you consult with one that is board certified/eligible and has experience treating scars!