Thanks for your query at healthcare magic.
Though i did not understand the reason for administering BCG
at 14 yrs since your concern in the scar as the end result lets stay focused to that .
Though I would like to see the scar personally to tell you the exact management ,
There are various modalities for dealing with it :
Scar Revision by excision and suturing or serial excision or injecting a fat graft to elevate the depressed scar .The treatment line depends on the exact picture of the scar.
After one of the above procedures are done , it can be resurfaced by Fractional CO2 laser
The scar can be made to be absolutely inconspicuous but it cannot disappear completely