Great first FO!
What I do for the "bump" is to take one of my tiny crochet hooks and gently tug from the inside of the offending stitches, which would be on the inside of the hat. I usually do every other stitch, then depending on how it looks I will continue to do the rest. Sometimes just tugging on a part of each stitch. I never read this anywhere its just what I do.
Remember you are your worst critic. Enjoy your progress.
By the way the bump doesnt look so bad from here.