Doesn't Mutsuha have healing power? Why is she wearing this thing around her wounded arm? It should be healed

I think ur mixing her with the manga that has the potions girl

I'm confused too... maybe it just speeds regen a bit and I'm sure it was said that there will be no scars left

Her ability is to heal a bit faster and that wounds that would normally leave scars or disfigurement heal like a normal wound