Hand 90%

: Fingertips have the highest concentration of pain receptors (nociceptors) in the body.

: Tiny paper fibers and chemicals used in manufacturing (like bleach) can stay in the wound and irritate the dermis. Identifying a "Deep" Cut Paper Cuts: Why They Hurt, How to Treat Them, and More : Fingertips have the highest concentration of pain

Even shallow paper cuts hurt intensely due to several biological and physical factors: How to Treat Them