Dermatoglyphics (from ancient Greek derma=skin, glyph=carving) is the scientific study of fingerprints, lines, mounts, and shapes occurring on the hands and feet. Dermatoglyphics refers to the formation of naturally occurring ridges on certain body parts, namely palms, fingers, soles and toes. These are areas where hair usually does not grow and these ridges allow for increased leverage when picking up objects or walking barefoot. The fingerprints of both hands are not the same. Also, they do not change pattern or shape throughout a person's life, except in cases of serious injuries that scar the dermis.
The unique characteristics of a person's fingerprints have been thought by some to be tied to a person's personality and preferences. This belief is the basis for the study of palmistry.
Source: https://en.wikipedia.org/wiki/Dermatoglyphics (derived at 22-3-2016)
According to the site dermatoglyphics.org: Striae generally refers to stripes in the body. Our fingers and feet have the most stripes (lines). Striae formation begins at 19 weeks during pregnancy, when the brain and spinal cord begin to develop separately. At this time, the number of creases will gradually begin to form in the brain, and these creases will be reflected on the fingerprints. Our 10 fingerprints reflect the different regions of our brain. It is unique and it will not change.
Source: http://dermatoglyphics.org/ (derived at 22-3-2016)
If we have committed a crime or when crossing a border, we often have our fingerprints recorded by the authorities. Fingerprints are absolutely personal.