How much is it to remove a nevus becker? How many sessions will it take? Will it actually work?

Hello I am 20 years old and I was told I have a nevus becker and that it is not removable. At the age of 10 they tried to do laser on a very small part, but I was too young and it was too painful to continue with more sessions. So, with that being said, I want to give laser another try, but they keep telling it won't work. It is on my stomach about the size of a cucumber.