“Many confounding factors in real life—including lifestyle, UV exposure, occupational hazards, and immune status—can ...

What happens when tattoo ink is injected into your skin? Most of it remains firmly lodged there, but some pigments travel to lymph nodes or even destinations in your body that are farther afield. All ...

Tattoos have gained widespread popularity, with nearly one in three Americans having at least one. But beneath the colorful designs lurks a hidden journey. According to a new study, tattoo ink doesn’t ...