As of August 2014, Kids Health, Mayo Clinic and Tattoo Info offer informative advice and general information on tattoos. As of December 2013, approximately 45 million Americans received, or were getting, at least one tattoo, according to Statistic Brain.
A tattoo is made by a needle breaching the top layer of skin and embedding ink droplets underneath the dermis. This can cause slight to significant pain, as the process is completed without anesthetics. Tattoos may cause serious skin infections if the artist does not use a clean needle. Some ink colors that may cause allergic reactions. Tattoos may also distort an image from an MRI.