What to expect after cortisone injection into fibrous bumps at end of suture line on day 12?

The bumps are not unusual and would probably improve without any treatment. The addition of steroid injection usually ensures a satisfactory result. If you are not fully pleased with the appearance, the bumps can simply be excised again. I hope you find this helpful. 

This is a common place to develop a small lump after an upper eyelid blepharoplasty.  The skin in this area is thicker than the rest of the lid.  It is also where the incision ends so you can get some bunching of the skin.  With some massage and the steroid injection these almost always flatten out.  

Best to have the little nubbin of skin excised under local.  Yes it extends the scar a bit but when it fades it will not be noticeable.  Best wishes!

You should see that bump begin to flatten over the next month.  Steroid injections do not work overnight.  They take time.  But overall eyelid scars generally heal beautifully.  Full Scar maturation can take 6-12 months.Good Luck.

Overall, upper blepharoplasty incisions heal without many issues or complaints. Your surgeon will follow your incisions very closely as they are healing, and if anything does come up he or she can be right on top of it to answer your questions and take care of it if needed. That seems to be the situation that you are having, these bumps that you are experiencing can occasionally form at the medial or lateral ends of the incision. It sounds like everything is being done correctly, massage, steroid injections, and most importantly time will most likely take care of them. With the small chance that these do not resolve the bumps, they can easily be re-excised, which is another procedure, but is a very minor procedure with just local anesthesia.Be patient and reassured that your surgeon is doing everything that he or she can, stay in close communication, and everything should work out with a good long-term result.