A very old art, with some very questionable ingredients

Tattooing is one of humanity's oldest practices. Ötzi the Iceman, a man who lived more than 5,000 years ago and was preserved in the Alps, carries dozens of tattoo marks, and tattooing appears across ancient cultures worldwide.

The materials used back then were whatever people could find: soot, charcoal and ash, plant extracts, and natural earth pigments. Later centuries added mineral and metal-based colours, some of which we now know are toxic. Nobody was testing these for safety. If something made a lasting mark and the person survived, it counted as "good enough".

Modern tattooing is a different world. Pigments are manufactured in dedicated facilities, inks are supplied in sterile single-use setups, and regulators now pay real attention to what goes into the bottle. But "better than the Bronze Age" isn't the same as "fully studied", so let's look at what researchers have actually found.

What the studies say, and how strong the evidence really is

The most talked-about research of the last couple of years has looked at whether tattoos are associated with cancer, particularly lymphoma and skin cancer. Here's the honest summary:

• A 2024 Swedish study compared nearly 12,000 people and found that those with tattoos had a 21% higher risk of malignant lymphoma. It accounted for factors like age, education, income and smoking.
• A 2025 Danish twin study also reported higher rates of lymphoma and skin cancer among tattooed people, with larger tattoos (bigger than a hand's palm) linked to higher risk. Interestingly, the Swedish study found no such link with size, so the two studies don't fully agree with each other.
• Other studies point the other way. A large French study reported no association between tattoos and skin cancer, and a Utah study found that people with more tattoo exposure had a lower risk of melanoma. In October 2025, researchers at the University of Nottingham pooled all available studies on tattoos and non-Hodgkin lymphoma and found no evidence of an increased risk.

So what can we conclude? Mostly, that the question is still open. A few things make it hard to draw firm conclusions from any single study:

1. These are observational studies. They can show that two things occur together, but they can't prove one causes the other. People who get tattoos may differ from people who don't in ways that are hard to measure: sun exposure, lifestyle, even how likely a skin change is to be noticed (a lesion hidden under ink may be spotted later).
2. Results conflict. When good studies disagree, that usually means we don't yet have enough evidence to draw a firm conclusion in either direction.
3. Biology is plausible but unproven. We know ink pigment particles can travel to nearby lymph nodes, which is why researchers keep investigating. But "plausible mechanism" is a reason to keep studying, not proof of harm.
4. Long-term data takes decades. Modern tattoo inks, and the rules around them, are relatively new, and cancers can take many years to develop.

The fair reading: there's no solid evidence that tattoos cause cancer, there's no proof they're risk-free, and researchers are calling for more and better-designed studies. That's a normal state of affairs for a lot of lifestyle questions. It's a reason to be informed, not a reason to panic.

The risks that are realistic today

While scientists keep working on the long-term questions, the problems that actually happen to real people are more down-to-earth, and mostly preventable.

Irritation and normal healing. Redness, swelling, tenderness, itching and flaking in the first days and weeks are part of normal healing. Your skin has just been through a controlled injury.

Infection. This is the most common serious complication, and it usually comes from what happens after the session: touching the tattoo with unwashed hands, picking scabs, soaking in baths, pools or the sea too early, or covering it with unsuitable products. Warning signs include redness that spreads, increasing pain or heat, swelling, pus, a bad smell, or fever. If you notice any of those, see your GP or a pharmacist promptly rather than waiting it out. Less often, infection can be traced to contaminated ink or equipment, which is why a studio's hygiene standards and ink sourcing matter so much.

Allergic reactions. Some people react to a pigment or an ingredient in the ink, with itchy, raised or persistently inflamed patches, sometimes appearing weeks, months or even years after the tattoo healed. These reactions are uncommon, but they're the main reason it's worth asking questions before you book (more on that below).

Sun damage. A fresh tattoo exposed to strong sun can blister, heal poorly and fade early. Sun protection is both a health issue and a quality issue.

The good news: following aftercare instructions from your artist, choosing a professional studio and looking after your skin removes most of the avoidable risk.

Putting it in perspective

None of this means you should ignore the research. But it helps to see tattoo risk next to the everyday exposures most of us accept without a second thought.

• Smoking is the single biggest preventable cause of cancer in the UK, and its health harms are established beyond any doubt.
• Sun exposure and sunbeds. UV radiation is classified by the World Health Organization's cancer agency as a definite human carcinogen, and a sunburn does more damage in an afternoon than most people realise.
• Alcohol is also classed as a definite carcinogen, and processed meats like bacon and sausages are in the same category of evidence (that classification describes how strong the evidence is, not how big the risk is, but it shows how routinely we live with these exposures).
• Ultra-processed food and sugar are linked to weight gain and, through that, to higher risk of a range of conditions, including several cancers.

The point isn't "everything is dangerous, so who cares". It's that tattoos belong on the same spectrum as other choices we make about our bodies, a spectrum where the evidence for some harms (like smoking) is overwhelming, and for tattoos is still uncertain and being actively investigated. A sensible approach is the same for all of them: know the facts, reduce avoidable risks, and make decisions you're comfortable with.

And if you're someone who smokes, sunbathes without protection or eats a very processed diet, you don't need to feel judged here. We just mean it when we say your tattoo is rarely the biggest factor in your long-term health.

Why ingredients get banned, and why that's reassuring

You may have seen news that certain tattoo ingredients are being restricted. Understandably, this can sound alarming: "Wait, was my ink dangerous?"

In reality, a ban like this is usually a precaution, and a sign that the system is working. Here's how it tends to go: regulators look at chemicals that are classified as harmful elsewhere (for example, substances restricted in cosmetics because of concerns about cancer, genetic damage or skin sensitisation), and ask why they should be injected into skin when they can't be used on it. If there's doubt, they restrict the substance and ask manufacturers to reformulate. They don't wait for proof that someone has been harmed.

The EU did this in January 2022, restricting thousands of substances in tattoo inks under its REACH chemicals regulation. In Great Britain, the Health and Safety Executive recommended a similar restriction, and the UK Government confirmed its decision to restrict hazardous substances in tattoo inks in December 2025. Before that, there was no legislation in Great Britain controlling what could be in tattoo ink at all, so this is a genuine step forward for anyone who gets tattooed here.

The key takeaway: a restriction means the rules are getting stricter before a problem is proven, which is how good safety regulation is supposed to work. Rules and deadlines are still bedding in, so it's always worth asking your studio what ink they use and how they verify it complies with current UK requirements.

If you have sensitive skin or allergies: how to protect yourself

For most people, tattoo ink is well tolerated. If you have eczema, psoriasis, a history of contact dermatitis, or a known allergy, particularly to metals, it's worth taking a few extra steps before booking.

1. Tell your artist about your allergies at the consultation. Mention any known allergies (for example nickel, chromium or cobalt, common culprits in metal allergies and in some jewellery reactions), skin conditions, and past reactions to cosmetics, hair dye, adhesives or latex. A good artist will want to know.

2. Ask about the ink. You're entitled to ask, and a professional studio will be happy to answer. Useful questions:

• What brand of ink do you use, and who supplies it?
• Can I see the ingredient list for this ink?
• Is the ink compliant with current UK rules on tattoo ink ingredients?
• Is it supplied sterile, and do you use a fresh, single-use setup for every client?
• If I'm allergic to a specific metal, can you check whether it appears in the ingredients?

If an artist can't or won't answer basic questions about what goes into your skin, that's worth noting before you commit.

3. Speak to your artist about precautions. If you have allergies or sensitive skin, or you're simply worried about a reaction, let your artist know. They can usually accommodate you. One example is applying a small drop of ink to your skin, covering it with clingfilm and watching for any reaction. That isn't something every client needs before a session, but it's there if you'd like extra reassurance. No test is a guarantee, though, as some reactions appear later. If you have a history of strong allergies, you can also ask your GP whether allergy testing makes sense for you.

4. Pick a good moment. Skip the session if your skin is inflamed, sunburnt or having a flare-up, and avoid booking right before a holiday in the sun.

5. Follow aftercare to the letter, and flag changes early. If you notice persistent itching, a raised or scaly rash, or swelling in the tattooed area weeks or months later, speak to your GP or a dermatologist, and let your artist know too.

The bottom line

Tattooing has come a long way from soot and ash. The research on long-term health effects is still developing, with studies that disagree and no proof either way, while the practical risks today, infection, irritation and allergies, are well understood and largely preventable with a professional studio and good aftercare. Regulation is moving in the right direction, and asking questions about ink is one of the smartest things you can do as a client.

Coming up in Part 2: we'll look at tattoo pigments one by one. Stay tuned next week.

Questions about ink, allergies or sensitive skin before booking? Get in touch and we'll happily talk it through.

Sacred Gold Tattoo Unit 74, Stable St., London N1C 4DQ +44 (0) 20 3668 7641 sacredgold.shop