Do you like tattoos? It is a form of body modification using ink to create a permanent design.
I have seen tattoos, but i think they are unattractive.  Where did this practice originate?
Aparently It has been practiced since at least Neolithic times as there have been mummified bodies found with tattoos from that period.
i would have thought Africa, but you are most likely correct.  Isn't tattooing oneself an unsanitary practice?  Can you catch diseases from a tattoo?
Process of tattooing
The process or technique of tattooing, creating a tattoo, involves the insertion of pigment into the skin's dermis. Traditionally, tattooing often involved rubbing pigment into cuts. Modern tattooing almost always requires the use of a tattoo machine and often procedures and accessories to reduce the risk to human health.
Physiological process of tattooing.
Tattooing involves the placement of pigment into the skin's dermis, the layer of dermal tissue underlying the epidermis. After initial injection, pigment is dispersed throughout a homogenized damaged layer
what was established practice at that time.
History Origins Alternate theories.
The 5,000-year-old mummified body of Ötzi the Iceman was found with 15 groups of tattoos, many of which were located at points on the body where acupuncture needles are used for abdominal or lower back problems. Evidence from the body suggests Otzi suffered from these conditions. This has been cited as evidence that practices similar to acupuncture may have been practiced elsewhere in Eurasia during the early Bronze Age; however, "The Oxford Handbook of the History of Medicine"