welcome to healthcare magic forum
by laser treatment
we can reduce to extent that it is fairly visible,but we can not remove it completely.
co2 fraction is good laser for it
you need to take 5 session for good result once in 20-30 days
avoid sun exposure and you can apply silicone containing cream over it .
in such big scar we can also do scar reduction treatment also .
better to consult dermatologist
and get it treated
i hope i answered your question