Although a loose sheet of<unk>  is usually too soft to<unk> , it can be very thin (sometimes as thin as a razor edge), thus being able to exert high levels of pressure, enough to cause a<unk> .<unk> s are most often caused by<unk>  sheets that are strongly fastened together (such as brand new sheet of<unk>  of a ream), because one single sheet might be dislocated from the rest. Thus all the other sheets are holding this dislocated sheet in position, making it stiff enough to act as a razor.
Paper cut
Souvenaid
CareFlite
BiteStrip
Dollond
Means–Lerman scratch
Chemical peel
Winpepi