Allergy risk: Metal particles from tattoo needles detected in the skin for the first time - Particles containing nickel and chromium also enter the lymph nodes

Micro and nanoparticles of metal from tattoo needles can be deposited in the skin and in lymph nodes. This is the result of researchers from the German Federal Institute for Risk Assessment (BfR)

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Tattoo inks are toxicological risks to human health: A systematic review of their ingredients, fate inside skin, toxicity due to polycyclic aromatic hydrocarbons, primary aromatic amines, metals, and overview of regulatory frameworks

Tattoo-inks-skin-deep

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Study: Bright Coloured Tattoos May Leak Heavy Metals Into Your Body, Causing Allergic Reactions - WORLD OF BUZZ

Tattoo, side effects - Altmeyers Encyclopedia - Department Dermatology

Red Is the Most Risky Ink Color, and Other Health Issues from Tattoos - MTV Lebanon

Are Some Metals in Tattoo Inks Harmful to Health? An Analytical Approach

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Tattoo healing: Common risks and what you should know

Tattoo allergy. Can we identify the allergen? - ScienceDirect