"The Romans called this pre-Celtic people Pictii, or "Painted," although Claudius' words are proof that (as claimed by many historians), the ancient Picts actually tattooed their bodies with designs. To the non-Roman Celtic world of Scots and Irish and the many tribes of Belgic England and Wales they were known as "Cruithni" and for many centuries they represented the unbridled fury of a people who refused to be brought under the yoke of Rome or any foreign invader."
Remember that Oetzi (The Iceman), Cherchen Man and The Beauty Of Loulan all had tattoos. Oetzi's tattoos actually match up to/with the well known Chinese acupuncture points. (Yes, everyone was suprized)
Oetzi's copper axe redated the copper age by 1,000 years older as well as indications of acupuncture points by about the same amount.