I remember reading that bees recognize the mouths and eyes of bears and will attack those areas when the bears go after the bee house. It’s probably the same for people so maybe the netting disguises the facial features and protects you from getting killed in case they do get aggressive since they can’t get to your face.
When stung, your body’s inflammation is limited by how thick and dense your skin is. The skin on your arms and hands is thicker and tougher, skin on your face is softer and thinner. So if you’re stung in one of the thin spots the inflammation.
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