The skin is one of the largest organs in the body and genetics (and its conditioning) is behind the formation of each of our organs so, thus far, it is not so far-fetched to think that your skin, and in particular the marks on your fingers can indeed reveal information about you. The surprising part arises when that information is not purely physical or biological but has to do with your intelligence and brain activity.
Fingerprints are formed at the same time as the brain’s cortex, which controls emotions and cognitive abilities such as concentration, memorization, the ability to behave or manage problems etc., which is clearly related to psychology. In fact, in cases where some children are born without a brain (encephalitic), they do not have fingerprints either. This and other keys to the embryogenesis process (formation of a multi-cellular organism from a zygote) prove the connection between the brain and fingerprints.
Fingerprints are unique to every individual, but they are also immutable. They remain unchanged from the time they are formed until you die. Although they are determined by every individual’s genetic information, their development is influenced by physical factors such as the exact location of the fetus in the uterus and the density of the amniotic fluid, among other things. Even in identical twins or clones (with the same DNA), the fingerprints of two individuals cannot be the same. However, there is the exceptional situation in which people are born without fingerprints. This condition is known as a dermatoglyphia.