08 Jul 2024 --- FDA researchers in the US say they are the first to investigate and find anaerobic and aerobic bacteria in commercial tattoo and permanent makeup inks, while another paper outlines key considerations for permanent makeup. “Unopened and sealed tattoo inks can harbor anaerobic bacteria, known to thrive in low-oxygen environments like the dermal layer of the skin, alongside aerobic bacteria,” says Dr. Seong-Jae Kim, a microbiologist with the Division of Microbiology, National Center for Toxicological Research at the FDA.