When can I get steroid injection in nose (for scar tissue) following breast implant surgery?

I'm scheduled for a breast augmentation and fat transfer procedure in March, but I am also 4.5 months out from a previous rhinoplasty surgery. Scar tissue is now evident on my nose and my nose surgeon wants to treat it with a steroid injection - how long after my breast implant/fat transfer woudl it be safe to receive thsi steroid injection into my nose? I don't want the steroid for my nose to negatively impact the healing/settling process of these other surgeries. Thanks!