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My brother got nerve surgery on his neck about 8 years ago. This is a picture of his face flushed after skateboarding. Any explanation as to why the redness stops perfectly at his scar?

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My brother got nerve surgery on his neck about 8 years ago. This is a picture of his face flushed after skateboarding. Any explanation as to why the redness stops perfectly at his scar?	1
If a morbidly obese person got shot would it do less damage than if a normal sized person got shot?	1