I don't believe that a small cut in the ear caused the balance problems. Coupled with the bleeding from the mouth I suspect a small skull fracture. The bruising behind the ear seemed evident and very like a Battles sign fracture.
You could try wearing extra protection on hands. Taping them at the joint or some football goalkeeper gloves have small spines along back of fingers to prevent fingers being bent back. Apart from that try strengthening the tendons in the hands and arms which may make them less flexible. Grip machines etc. Hope this helps, been troubled by hypermobility since I was a nipper.
If it hasn't been mentioned yet I have seen many pro bodybuilders with same bumps on abs caused from scar tissue injecting hgh/insulin which they do with a smaller needle and sideways under the skin.
In that case most boxers have “scar tissues.” And boxers aren’t body builders. let’s go and examine each fighter from thousands of photos available online and create suspicious fiction for what it could possibly be. Butt injections are the most noticeable too because it’s the most common place to go unnoticed
The problem with Canelo is that he seems to be going up in muslcle weight very easily without the related fat gain. This added with his AJ bodybuilder like physique and suspicious bumps on abs would point towards hgh/insulin. Traditional 'butt" ones are more androgenic which would give the wrong effects. I understand you may differ in opinion though.