What is this bump on child's ear 6 months after otoplasty? (Photo)

Doctor had a hard time correcting left ear because it lacked tone. We eventually noticed small sore, bloody spot on the front of the ear. We started applying Neosporin nightly and it turned into a blister then hardened over next couple months. Dr thought it was stitch reaction at first, but now doesn't think that's what it is. We are happy with result but wish this bump would disappear. Thoughts on what it is and treatment options would be appreciated. Thank you