Key takeaways
- There is no fixed session count: the FDA says removal takes multiple treatments a few weeks apart.
- The Kirby-Desai scale scores six factors, including skin type, location, color and layering, to estimate sessions.
- Green, red and yellow inks are the hardest to remove; dark blue and black are the easiest.
- The evidence that picosecond lasers beat Q-switched lasers is sparse, mainly for black and blue ink.
- Complete removal may not be possible in some cases, so get the estimate in writing.
What decides the number of sessions?
Laser tattoo removal works in two halves: the laser's energy shatters the ink into small particles, and your immune system clears those particles over time — the FDA calls it the most common method health care professionals use to remove or lighten a tattoo.
How many sessions that takes is not one number.
The closest thing to a counting tool is the Kirby-Desai scale, published in 2009, which scores six factors whose total roughly predicts the session count.
| Factor | Points the scale assigns |
|---|---|
| Skin type (Fitzpatrick) | 1–6 |
| Location on the body | 1–5 |
| Ink color | 1–4 |
| Amount of ink | 1–4 |
| Scarring or tissue change | 0–5 |
| Layering of the ink | 0–2 |
Tattoos scoring more than 15 points may be difficult to remove, the scale's authors wrote.
Color is the factor with its own ranking: the FDA says green, red and yellow inks are the hardest to remove while dark blue and black are the easiest, and that multicolored tattoos may need multiple lasers because different colors absorb different wavelengths.
The American Academy of Dermatology (AAD) turns that into a question for the practice: a single laser cannot remove all ink colors, so a provider who has only one laser may leave some ink behind.
Easiest inks to remove
- Dark blue
- Black
Hardest inks to remove
- Green
- Red
- Yellow
- Multicolored tattoos may need multiple lasers
Skin type works the other way.
The Kirby-Desai paper notes that darker skin types see a higher rate of adverse effects, especially hypopigmentation — skin lighter than the surrounding skin — and get lower efficacy per session, because operators use lower settings and wait longer between treatments.
The scale is not the whole assessment: the AAD's consultation checklist also covers how long you have had the tattoo, how deep the ink sits, its colors, its body location, your health and medicines, and any history of raised scars.
FDA warns that flesh-colored and white inks and permanent makeup can oxidize — turn black — when treated by laser, and oxidized pigment is no longer treatable by laser. If your tattoo or permanent makeup uses those pigments, that is a question to settle in the consultation before any session is booked.
How far apart are sessions?
The FDA's spacing is not a number: laser tattoo removal needs multiple treatments a few weeks apart.
The one interval named precisely in the sources for this page belongs to the Kirby-Desai study — its authors assumed 6 to 8 weeks between treatments.
The wait does two jobs, and both belong to your body.
The AAD explains that skin needs time to heal between treatments, and that it is your body — not the laser — that flushes the shattered ink particles out, working through ink that sits in layers.
Skin tone can stretch the calendar: the Kirby-Desai paper notes that on darker skin types operators use lower settings and wait longer between sessions, part of why efficacy per session is lower there.
The study counts behind the 3-to-20 range were measured at 6-to-8-week spacing, so a session estimate built on that scale assumes the same calendar. If a practice offers to compress the schedule, ask what its estimate is based on now.
How long until the tattoo is gone?
Put the study's figures side by side and the timeline takes shape: satisfactory removal took an average of 9.91 treatments (± 3.18), with individual counts from 3 to 20, in 100 patients treated with Q-switched Nd:YAG or alexandrite lasers at 6 to 8 weeks between treatments.
The score tracked the session count (r = 0.757), which is what makes the scale usable as an estimate.
Read those numbers as one study's picture, not a promise: it is a 2009 study of 100 patients at a single clinic, treated with the older nanosecond-era lasers, and a study average is not what any one tattoo will need.
The newer picosecond machines have their own evidence.
A 2016 systematic review of picosecond tattoo removal — 6 human trials, 160 participants — found 69–100% of tattoos reached more than 70% clearance after 1 to 10 treatments.
The same review found only sparse evidence that picosecond lasers beat the older Q-switched type, and mainly for black and blue ink, so the evidence does not establish that a newer laser means a shorter course.
The two studies behind the session counts
| Kirby-Desai study (2009) | Picosecond review (2016) | |
|---|---|---|
| Patients | 100 | 160 across 6 human trials |
| Lasers | Q-switched Nd:YAG or alexandrite | Picosecond |
| Treatments | Average 9.91 (± 3.18), range 3 to 20 | 1 to 10 |
| Outcome measured | Satisfactory removal | More than 70% clearance |
Notice what the trials measured: clearance, not a completion date.
None of the sources for this page gives a month-by-month countdown to a finished tattoo, and the honest timeline is the study's — a session count between 3 and 20, spaced weeks apart, with healing in between.
Each added session also adds a bill, which is why the estimate matters before you commit; our laser tattoo removal cost page explains how per-session and package pricing change that math.
Find laser tattoo removal providers near you
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Can a tattoo be fully removed?
The FDA's wording is the honest ceiling: complete removal can take many treatments, and in some cases may not be possible.
The trials agree in their own way.
The measure in the picosecond review was more than 70% clearance — not erasure — and 69–100% of tattoos reached it after 1 to 10 treatments.
The same hard cases show up under that ceiling.
Green, red and yellow inks are the hardest to remove, the FDA says; a provider who has only one laser may leave some ink behind on a multicolored tattoo, the AAD notes; and the scale's authors flag tattoos scoring over 15 points as ones that may be difficult to remove.
Your own case is assessed in the consultation, where the AAD's checklist covers how long you have had the tattoo, the ink's depth, its colors, its location, your health and medicines, and any history of raised scars.
For how the treatment works, what it feels like and how to choose a provider, our laser tattoo removal guide covers the treatment end to end.
FDA says complete removal may not be possible in some cases, and session counts in studies ranged from 3 to 20. A provider who guarantees complete removal in a set number of sessions is going past what the FDA's wording supports — get the estimate, and the fallback if the tattoo is not done, in writing.
Frequently asked questions
How many laser tattoo removal sessions does a small tattoo need?
The sources do not give a count by tattoo size.
In the Kirby-Desai study of 100 patients, satisfactory removal took an average of 9.91 treatments, with individual counts from 3 to 20.
The scale's six factors are skin type, location, color, amount of ink, scarring and layering — physical size is not a separate one — though the FDA names size and colors among the factors that set the number.
A consultation estimate built on your tattoo is the count that fits it.
Can you book laser tattoo removal sessions closer together?
The study the session estimates come from assumed 6 to 8 weeks between treatments, and the FDA's wording is only a few weeks apart.
The interval is not idle time: the AAD explains that skin needs to heal between treatments and that your body, not the laser, flushes the shattered ink out.
None of the sources for this page tests a shorter interval, and the Kirby-Desai paper notes operators already wait longer between sessions on darker skin types.
Will a newer picosecond laser need fewer sessions?
The evidence is thin.
A 2016 systematic review of picosecond tattoo removal — 6 human trials, 160 participants — found 69–100% of tattoos reached more than 70% clearance after 1 to 10 treatments, but found only sparse evidence that picosecond lasers beat the older Q-switched type, mainly for black and blue ink.
On that evidence, a newer machine is not by itself a documented reason to expect a shorter course, so ask which laser a practice would use on your colors and why.
Can colored tattoos be fully removed?
Color is one of the strongest limits.
The FDA ranks green, red and yellow inks the hardest to remove and dark blue and black the easiest, and says multicolored tattoos may need multiple lasers because each color absorbs a different wavelength.
The AAD adds that a single laser cannot remove all ink colors, so a provider with only one laser may leave ink behind.
The FDA also warns that white and flesh-colored inks and permanent makeup can turn black under laser — and then no longer respond to it.
Sources
Every number on this page comes from one of these sources and was checked against it.
- Tattoo Removal: Options and Results · U.S. Food and Drug Administration
- Tattoo removal: Lasers outshine other methods · American Academy of Dermatology
- The Kirby-Desai Scale: A Proposed Scale to Assess Tattoo-removal Treatments · National Library of Medicine
- Picosecond lasers for tattoo removal: a systematic review · Reiter et al., Lasers Med Sci, 2016
Medical disclaimer. MedSpaStandard is for education only and is not medical advice. Talk to a licensed provider about your own health, and check any provider's license with your state board.