There are a couple things at play here, some involving the paper, some
involving your skin. For one thing, what part of your body comes in
contact with paper the most? Right, the majority of paper cuts happen on
the fingers and hands. Your hands are pretty complex sensory
instruments, and they're absolutely jam-packed with nerve fibers called
nociceptors.
These guys sense temperature, pressure and pain, and there are more of
them per square inch in your hands and fingers than most other parts of
your body. Injuries there are noticed much more than similar injuries
elsewhere. The same small paper cut on a less nerve-dense area, such as, say, your leg, won't send nearly as many pain signals to your brain.
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