A colleague on our team went through this and told it to me in her own words. What follows is hers, first-person, as she said it. — Chin Qi Yong
No — it cures the gel, and that's the whole of its job. I'd been getting my nails done for years before an infection sent me looking up what that lamp is actually for. I had it backwards.
I noticed it about ten days after the manicure. A small patch of pale green along the edge of my thumbnail.
I didn't think infection. I thought stain — polish, or something I'd got into. I took a buffer and went over it lightly, the way you'd rub at a mark on a shirt. It didn't come off. But it didn't hurt, didn't itch, wasn't red or swollen, so I left it alone and got on with the week.
A few days later it wasn't small and it wasn't pale. The whole nail had gone soft, lifting slightly away from the skin underneath, and pressing on it gave a dull ache. I took the set off at that point, and taking it off was the part that frightened me — underneath, most of the nail had gone green, and the green had gone grey at the edges.
The doctor sent a clipping to the lab and it came back as a bacterial infection of the nail.
The gap between seeing it and doing something about it is the part I'd change. Once the colour wouldn't rub off and the nail had started going soft, guessing had stopped being my job.
It cleared up over about a month of treatment. The nail itself took two or three to grow back out.
Does paying more mean a safer salon?
Not in my case. I only ever went to the expensive chains in the mall, and it happened anyway.
Paying more was the whole of my safety system, and I'd been running it for years: go somewhere that looks looked-after, clean, well finished, priced well above the little studios. I'd have told you quite confidently that it worked.
I also didn't know what I was protecting myself from. If you'd asked me what could go wrong at a nail salon, I'd have said thin nails, brittle nails, maybe some damage if you overdo it. It never crossed my mind that I might end up at a doctor. So I never watched what they did with the tools. I wouldn't have known what I was looking at anyway.
I still don't know where mine came from. Nobody can go back and check, and I'm not going to claim otherwise. The paper I ended up reading lists what this bacterium likes: a nail lifting away from the bed underneath it, somewhere warm and damp. Which, where we live, is just called the weather.
What I can tell you is what I found when I finally went looking — and one of the things I found was that I'd been wrong about something for years.
Does the UV lamp at a nail salon disinfect the tools?
No. And I had quietly assumed for years that it did.
Not as a considered belief — more as a background hum. There's a lamp. It glows a strange colour. It's ultraviolet, and ultraviolet is the thing hospitals use to kill germs. So somewhere in the back of my head, that lamp was doing a second job while it sat there. I never once said this out loud, which is probably why I never noticed it was nonsense.
Ultraviolet isn't one thing. The kind used for disinfecting is a short, high-energy band — UVC, the sort of light in the germicidal lamps you'd find in a lab. The kind in a nail lamp is a different band entirely, the long one, UVA, and its job is chemical: it sets the gel. Cures it, hardens it. That's the whole task.
The medicines regulator overseas, writing about ultraviolet disinfection, puts a number on the gap — the long kind is a thousand times weaker at killing things than the germicidal kind, in the case they were testing. It also makes a point that stuck with me: ultraviolet only does anything to what it directly lands on. Dust or residue in the way, and it doesn't get through.
So even if that lamp did disinfect, it would only ever reach the surface it was pointed at. Not the inside of a nipper.
What is the lamp doing, then?
It's shining on your hands.
That's the honest answer, and it took me a moment to sit with. The dermatologists who've looked at this say that nail lamps put out mostly the long kind of ultraviolet, and that the risk from a manicure is low — but it accumulates, and it's worth reducing. The suggestions are unglamorous: fingerless gloves, or sunscreen on the backs of your hands before you go in.
Low risk, worth reducing. That's a much duller sentence than the internet usually gives this topic, and it's the one I'd rather repeat.
But notice what happened to my mental picture. I thought the lamp was quietly protecting me. It was quietly doing the opposite — mildly, slowly, on the one part of me that was actually under it. The tools were never in that beam at all.
So how do you tell whether a salon is careful?
I'll say plainly where I land: mostly you can't, not from the room itself. The price, the fit-out, the chain's name on the door, that lamp — all of it looks like information, and none of it was ever said to me by anyone who'd have to stand behind it. I supplied every bit of it to myself.
So there are two things I ask now, because they're the only two I've found that somebody actually has to answer:
Can I bring my own tools? And do you change and disinfect everything between clients?
Listen to the shape of the reply more than the content. Someone with a process will tell you the process — what gets binned, what gets cleaned, how. Someone without one will tell you not to worry, we always disinfect, in the tone you'd use with a fussy customer. The vagueness is the answer.
And I should be honest about where all this has actually left me. My nail only finished growing back out this month. I've asked at a few places since, both questions, and I still haven't booked anything. I keep not deciding. Part of that is knowing a good answer still isn't proof — it's just an answer somebody has to stand behind, which is more than I had before. Part of it is that I'm in no hurry to find out I'm wrong again.
Wanting to look nice was never the problem, and I'm not about to tell anyone it is. I'd just like it to rest on something sturdier than a glowing lamp and a nice front desk.
For years I let that lamp make me feel safe, and I never once asked about it. Now I'd rather just ask someone — a room can't answer you back.
This article is general skin and consumer information, not medical advice. It is not a guide to diagnosing anyone, and it does not rate or recommend any salon or service. Last reviewed: August 2026.