Feedback please on 5-FU injection at 12 months post revision rhinoplasty

I am at 12 months post revision rhinoplasty. My surgeon injected me a total of 3 times so far with steroids (a milder version of Kenalog) which has helped with healing of the bridge very well. However, the tip is still quite bulbous and due to my thick skin I was wondering if adding 5-FU to the steroid at this stage could help things a bit more? I have read from surgeons who used 5-Fu during initial stage of healing but can it be used 12 months in?