How do tattoos create permanent designs in the skin?

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Body modifications and mutilations Peruvian elongated skulls, trephined male (left) and intact female (right), c. 1000 bc.

Tattoos create permanent designs by introducing pigment into the skin through deliberate ruptures or punctures.1

Historically and culturally, this process has been achieved through various techniques, including:

Simple pricking: Directly piercing the skin to deposit color.1
Needle punctures: Drawing a thread coated in pigment underneath the skin.1
Tapping: Using implements shaped like rakes or bone adzes to strike pigment into the skin.1
Incisions: Rubbing pigment into knife slashes.1

Regardless of the specific tool used—ranging from traditional bone implements to modern electric tattooing machines—the fundamental mechanism remains the same: the skin is breached to embed ink or pigment into the dermal layer. While these marks are intended to be permanent, they carry health risks, such as allergic reactions or the transmission of infections like hepatitis and HIV if sterile conditions are not maintained. Modern advancements have also introduced specialized inks contained in nano-beads, which allow for a permanent appearance while facilitating easier removal via laser surgery.1