Should I excise my keloid? I have a big lump of scar tissue under the skin

i asked a doctor abt it, and he said that injections would do fine, to flatten it. however, he touched it, and on the surface, there is very little scarring. however, underneath my skin, there is a big lump of scar tissue. can i ask him to cut the part of the flesh not affected by keloids as well, to fully prevent any keloid scar from remaining, so that it does not have any recurrence chance?