Table of ContentsView AllTable of ContentsUsesHow Q-Switch Lasers WorkBefore TreatmentTreatment DayRecoverySafetySide EffectsFrequently Asked Questions
Table of ContentsView All
View All
Table of Contents
Uses
How Q-Switch Lasers Work
Before Treatment
Treatment Day
Recovery
Safety
Side Effects
Frequently Asked Questions
Q-switched lasers are commonly used to treat spider veins, acne scars, and wrinkles, as well as some fungal infections likeonychomycosis(toe fungus) and athlete’s foot. They were once considered the gold standard of tattoo-removal.
Q-switch lasers use a “Q-switched” technique to emit tight pulses of concentrated photons (light energy). The laser beam is powerful enough to penetrate deep into the skin yet gentle enough to treat the face. The FDA considers the Q-switch laser safe and effective for its intended uses.
This article reviews the various types and uses of the Q-switched laser. It discusses how Q-switch lasers work for tattoo removal and addresses the side effects associated with Q-switch laser procedures elsewhere on the body.
mkrberlin / Getty Images
The Q-switched laser serves many purposes in cosmetic dermatology.
Since it is non-ablative, the Q-switch laser can heat deeper layers of skin without damaging or scarring skin tissues. This makes it a valuable tool in skin resurfacing (i.e. wrinkle reduction), not to mention its various medical uses.
Tattoo Removal
Q-switch lasers come in different wavelengths. Lasers with 1064 nanometer (nm) wavelengths are used to remove dark blue or black tattoos, while those with 532 nm wavelengths can remove red, sky blue, and green colors.
When used correctly, Q-switch lasers break down tattoo ink without damaging or scarring the surrounding skin.
For one 2015 study, 12 blue or black tattoos were each treated three times with a 1064 nm wavelength Q-switched laser. The improvements were significant, although none of the tattoos were completely gone after three sessions.
The report also mentions that the most significant improvements were seen in tattoos that were done at least 10 years before.
Skin and Vascular Lesions
Q-switched lasers can be used to treat pigmented skin lesions and vascular (vein) lesions, including but not limited to:
Nevus of Otais hyperpigmentation on the face and sometimes in the eye, usually on just one side. In 2014, researchers noted excellent improvements in nevus of Ota following Q-switch laser removal. No adverse side effects were reported and little to no recovery time was needed.
Melasmais a condition in which hyper-pigmented spots or patches form, typically on the face. Studies show that Q-switched laser treatments can fade them substantially within three, once-per-month treatments. Only mild, temporary side effects like itching have been reported.
Cafe-au-laitare flat patches of hyper-pigmented skin seen on newborn infants. For a 2019 study in China, cafe-au-lait spots in 471 children were treated with Q-switch lasers. An overall success rate of 79% was reported for cafe-au-lait removal with no adverse side effects reported.
Skin Rejuvenation
Laser liposuctionis a non-invasive alternative to liposuction with little to no recovery time. Q-switched lasers are widely used in laser liposuction, as they can effectively reduce unwanted fat while minimizing tissue damage. One 2014 study found that Q-switched laser liposuction resulted in 54% less blood loss compared to traditional liposuction.
Acne scarscan be effectively treated with a Q-switched laser. A 2022 study published in the journalMedicinashowed significant acne scar improvements within three, 1064 nm Q-switch laser treatments, done every eight weeks. No significant side effects were reported. The Q-switch treatments were regarded as safe and effective.
Skin resurfacingprocedures are commonly done using Q-switched lasers. Treatments aim to improve skin tone and texture, diminish wrinkles, and reduce the skin’s oil production. A study published in 2022 found that Q-switch laser treatments substantially reduced dark circles and wrinkles under the eyes within six treatments.
Are Q-Switched Lasers Good for Hair Removal?Q-switched lasers are FDA-approved for lightening or removing hair.
Are Q-Switched Lasers Good for Hair Removal?
Q-switched lasers are FDA-approved for lightening or removing hair.
Q-switched lasers are available in different wavelengths. In terms of tattoo removals and hyperpigmentation, Q-switched lasers with wavelengths of 1064 nm and 532 nm are most beneficial. Longer wavelengths penetrate deeper into the skin.
For example, since black tattoo ink is deposited into the epidermis (second) layer of skin, a 1064 nm wavelength is needed to remove it. Freckles, on the other hand, are a build up of melanin in the skin’s dermal (first) layer of skin, so a 532 nm laser is better suited to treat them.
Q-Switched Laser Indications
Blue and black tattoo removal
Nevus of Ota
Lentigines
Melasma
Cafe-au-lait
Skin resurfacing for wrinkles and acne scars
Red, light blue, green tattoo removal
Port wine birthmarks
Spider veins
Freckles
Seborrheic keratosis
Unlike other types of common lasers that emit one continuous laser beam, Q-switched lasers emit brief pulses of more condensed light energy with a uniform wavelength. The advantage of this is that it allows for more precision while minimizing heat build-up and tissue damage under the skin.
Laser treatments are typically done every six weeks. Depending upon the size and color of the tattoo, multiple sessions may be needed, sometimes up to twenty. This can depend on the tattoo’s colors, the type of ink that was used, when the tattoo was done, and more.
Many times, tattoos are unable to be removed completely. In particular, multi-colored and layered tattoos, such as tattoo cover ups, may be more difficult to remove.
Hyperpigmentation
Hyperpigmentation occurs when there is an excess production of melanin, the natural pigment in skin, hair, and nails. Melanin is produced in the skin’s epidermis (second layer), where collagen is produced.
In the days and weeks after a Q-switch laser skin treatment, the treated skin will get to work producing collagen, helping skin cells to repair the skin as the tattoo fades.
Consultations with a healthcare provider or dermatologist are typically required before a laser procedure. During your consultation, your provider may:
The consultation is a great time to ask questions.
Whether you choose to follow through with a procedure after your consultation is entirely up to you. In some cases your provider may be able to perform the procedure within the same day. Other times, you may need to book for a later date.
In the lead up to your procedure, your provider may ask you to avoid using scrubs, exfoliants, bleaching creams, or retinoids on the skin area being treated. They may also ask you to avoid the sun.
Your provider may or may not have you wear a medical gown. They may apply a numbing cream or local anesthetic to your skin before the procedure begins. You will also be given eye shields to protect your eyes.
For Q-switched laser treatments, providers should do a ‘test spot’ on the skin to ensure the laser and its settings are compatible with your skin type.
Q-switched laser treatments can take anywhere from 10 to 45 minutes, depending on the procedure and how big or layered the treatment area is.
Afterwards, you may be given the option to schedule your next laser treatment, if needed. There should be at least six to eight weeks between each laser session.
Once your Q-switched laser treatment is finished, your provider will cover the treated area in a sterile bandage. Your provider may ask you to:
You may need to apply an antibiotic or antiseptic ointment to the treated area and keep it covered for 7 to 10 days.
Q Switch Laser Safety
Q-switched laser technology is widely regarded as safe and effective. In addition, studies have found high levels of patient satisfaction following Q-switched laser treatments.
One such study from 2022 evaluated the safety and efficacy of a 1064 nm Q-switched laser for treating dark circles and wrinkles under the eyes.
Before and after photos show Q-switched laser treatments resulted in clear reductions in wrinkles and melanin. The only side effects reported were mild irritation and redness, lasting just a few days post-procedure.
Possible Side Effects
Side effects after Q-switched laser treatments are uncommon but can include:
Contact your healthcare provider right away if you develop blisters or signs of infection.
Who Should Not Get Q-Switch Laser Treatment?You should not be treated with a Q-switch laser if you have an active viral, bacterial, or fungal skin infection. Laser treatment is not recommended when there is an inactive herpes infection because it’s been reported to activate latent herpes infections.
Who Should Not Get Q-Switch Laser Treatment?
You should not be treated with a Q-switch laser if you have an active viral, bacterial, or fungal skin infection. Laser treatment is not recommended when there is an inactive herpes infection because it’s been reported to activate latent herpes infections.
Summary
Q-switched lasers are a commonly used laser to help treat many skin conditions, from pigment changes to tattoo removal. The type of laser and the wavelength given is dependent upon each person and the reason they are having laser treatment.
A Word From Verywell
Q-switched laser therapy can be an effective treatment for your skin condition or tattoo removal. Whatever the reason, be sure to ask your healthcare provider about any questions you may have about the procedure, and any special instructions you need to follow to get the best outcome.
Frequently Asked QuestionsIt depends on the reason you’re getting the laser treatment. For example, using a Q-switched laser to treat toenail fungus may only take two treatments. Tattoo removal with a Q-switched laser may take six or more treatments.They are similar but not the same. The amount of time the laser is administered is how the Pico laser got its name. It has been shown that picosecond lasers may be more effective than nanosecond lasers (like the Q-switched).Yes, the results of a Q-switched laser are permanent.Healing times may vary depending upon the procedure the Q-switched laser is used for, but generally takes a few weeks.
It depends on the reason you’re getting the laser treatment. For example, using a Q-switched laser to treat toenail fungus may only take two treatments. Tattoo removal with a Q-switched laser may take six or more treatments.
They are similar but not the same. The amount of time the laser is administered is how the Pico laser got its name. It has been shown that picosecond lasers may be more effective than nanosecond lasers (like the Q-switched).
Yes, the results of a Q-switched laser are permanent.
Healing times may vary depending upon the procedure the Q-switched laser is used for, but generally takes a few weeks.
18 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read oureditorial processto learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
Food and Drug Administration.510(k) summary for RevLite Q-Switched Nd:YAG laser system.
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