HEALTHCARE. Body tattoos affect the immune system in a way medicine has long suspected. Now, there is proof.

A new study published in PNAS by researchers at the Università della Svizzera italiana (USI) has demonstrated that none of the three prevailing assumptions is entirely correct.

The ink does not stay put

Between 60% and 90% of the pigment leaves the dermis and migrates to the lymph nodes, liver, spleen, and lungs.  And not merely in trace amounts, but in measurable, accumulating, and persistent concentrations.

The body has no mechanism to eliminate them; once inside, they remain.

Researchers describe what follows as an immune response that never switches off. Macrophages. Cells tasked with detecting and neutralizing threats recognize the ink as a foreign body and attack it.

Yet, they cannot digest it

They die in the attempt. The macrophages that replace them inherit the ink from the dead cells and repeat the cycle.

This chain of failed attacks triggers chronic inflammation in the lymph nodes, causing no visible symptoms, yet having measurable effects on immune system function.

Not all pigments are alike. Cellular toxicity tests revealed that black and red inks cause greater macrophage death than other colors, resulting in a heavier inflammatory load and greater accumulation in organs.

Tattoos are Imported Ill Health

Black ink does this due to its carbon nanoparticles; red ink, due to the mercury and cadmium compounds found in traditional formulas.

The finding that sparked the most debate among the researchers themselves is the growing evidence that this chronic inflammation may interfere with the immune response to vaccines in people with extensive tattoo coverage.

LEFT. Forty Shades of Verse. A beautiful evocative gift from The Emerald Isle. Click the picture for details.

Effects no longer ignored

While the study is not conclusive on this point, the proposed mechanism is compelling, and the preliminary data are sufficient for the team to designate this a priority for future research.

For decades, medicine has not included tattoos in discussions about systemic health. This study argues that they can no longer be ignored.

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