A tattoo is a small, controlled wound, so hygiene matters more than décor or rating. Most professional studios take it very seriously; knowing what to look for lets you check in a minute.
“Infections mainly occur due to a lack of such procedures, especially in cases of amateur, home-made tattoos or if performed by unlicensed tattooist.”
In plain terms: the biggest infection risk is not tattooing itself but skipping hygiene — home tattoos, “scratchers” and unlicensed operators.
Rules vary by country, state and city. Where licences exist, studios usually display them; you can also ask your local health department. Mayo Clinic advises choosing a studio with properly trained staff and checking local licensing rules.[2]
“The instruments should be sterile and preferably all disposables should be used to prevent transmissible infections such as Hepatitis B, C and HIV infection and leprosy.”
“Hepatitis B and C and human immunodeficiency virus (HIV) transferred by tattooing remain a significant risk needing active prevention.”
In plain terms: single-use, sterile equipment is the standard, and blood-borne infections are why it matters. A hepatitis B vaccination beforehand adds protection.[2]
Ink itself can be contaminated even when the bottle is sealed, and the FDA — which does not approve tattoo inks — has recorded infections traced to contaminated inks, including a US outbreak linked to grey ink diluted with non-sterile water.[5][6] In the EU, a 2022 REACH restriction limits more than 4,000 hazardous chemicals in tattoo inks.[7]
“Contaminated tattoo ink is an open-window risk vector that can lead to epidemic tattoo infections across national borders due to contaminated bulk production.”
In plain terms: reputable studios buy ink from known manufacturers, never dilute it with tap or bottled water, and don’t reuse leftover ink. It is fine to ask which brands they use.
Are you licensed? Are needles single-use? How do you sterilise reusable tools? Do you pour fresh ink for each client? Do you give written aftercare?
Studio pages on TatSeek show a “Safety & hygiene” row under “Before you book”: items are marked “studio-reported”, and “document seen” only after we have checked a licence or certificate. “Not listed” means the studio hasn’t told us yet — not that anything is wrong.
Fact-checked against the sources above · last reviewed September 30, 2026. Quotations are taken word for word from the dermatologists’ published work; they have not reviewed this page. Who we quote and why →
General information, not medical advice. Your artist’s instructions come first for aftercare; signs of infection or an allergic reaction — or any health condition or medication you are unsure about — are a reason to talk to a doctor.