What causes fingerprints to be unique?

Fingerprints are completely unique to every individual person. ... A person's fingerprints are formed when they are a tiny fetus developing in their mother's womb. The faint lines you see on ... This straining pressure causes the skin to buckle, resulting in the folding of the epidermis into the dermis. read more

Fingerprints are inherently unique enough, though, to be at very little risk of being perceived as perfectly identical; there are a great many possible variations in fingerprints, with singles and multiples and inversions and combinations of the four basic shapes: loop, whorl, arch, and tented arch. read more