Our fingers( and palm) has the most densely packed nerve endings which can easily pick up stimulus like pain/ heat etc,
These pain receptors in the skin ( nociceptors) lie on the surface and deep layers of the palm), areas where Splinters actually reach, they pick up on the stimulus easily.
Splinters are also not smooth around the edges, so the cut they cause will be serrated rather than a neat clean cut.
Also they are so small the healing process doesn’t happen as fast as it normally would when a bigger cut activates a faster healing process around the cut area.
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