I've had to sew some up, like what you're talking about, where the skin was not just torn, but the exposed muscles cut too. After stitching them up, I cut the spurs of every rooster I could get my hands on. Didn't have any more problems with Hen Slashing for about a year. Then i cut spurs again.Her underwing looks very similar, just horribleAbout a 4”x4” area under one and 2”x2” under the other. She is molting as well so has less feathers than normal, so I’m sure that made a difference.