Dog ear from upper blepharoplasty - should I get it surgically fixed or try more injections?

Bumps on the end of the blepharoplasty incision can happen. If the injections (likely Kenalog/5FU) do not improve it then excision is best. Typically, if the bump has not improved after 3 months then I offer excision.

If multiple injections of, most likely, local corticosteroid, did not help, excision of the lesion should be done. Good luck.

Sorry you have this. Intralesional steroid injections typically do not work for this kind of issue. So, no surprise at the lack of success after two attempts. One simply approach is to simply "sculpt" the protrusion off flush with the surrounding skin and let the site heal. A second approach is flatten it flush with surrounding skin using electrodessication and then let it heal. Both approaches are performed using only local anesthesia and neither approach requires any stitches. You would be wise to consult with an experienced, board certified cosmetic dermatologist. Best of luck.

Based on the posted photos I recommend ONLY surgical excision to correct limited previous results. Expect fee $1,200. Best to virtual consult with.....

Regardless of the ideology, a surgical correction is necessary if you want to change the outcome. It should be easy enough to do in the office with a little local anesthetic. Revising this will extend your scar further.
Best,
Mats Hagstrom, MD