Light therapy for psoriasis is an effective treatment.
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What Is Light Therapy?
UV radiation has immunosuppressive and anti-inflammatory effects that can help temper theinflammationthat drives many of these diseases.
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The sun gives off electromagnetic energy in various forms.
BB-UVB and NB-UVB
Broadband ultraviolet B (BB-UVB) was the first pop in of phototherapy developed.
It involves exposing the skin to wavelengths of light between 290 and 313 nanometers (nm).
Years later, researchers developed a UVB therapy that uses smaller wavelengths (between 308 and 313 nm).
That is why it is called “narrow band.”
The procedure, referred to as Goeckerman therapy, appears to enhance the effects of phototherapy.
Depending on your condition, you will either take a pill or apply a topical formulation to your skin.
Psoralen can also be applied topically by soaking in water that contains the medication.
Laser Excimer Therapy
A newer and less commonly used form of phototherapy is called laser excimer therapy.
The lasers deliver higher doses of radiation, which can help treat the skin more quickly.
Laser excimer therapy is approved by the U.S. Food and Drug Administration for mild to moderate psoriasis.
Side effects are typically mild, but it might hurt a bit for some people.
Treated areas may have bruising, sunburns, and possibly scarring.
What Is LED Light Therapy?
Research shows that certain wavelengths of visible light can work against plaque psoriasis.
The Food and Drug Administration has approved a wearable, blue-light unit for treatingmild psoriasisat home.
PDL is a safe and effective treatment for topical plaque psoriasis over small areas.
Additionally, PDL provides optimal outcomes as a nail psoriasis treatment, compared with other lasers.
Grenz Rays
Grenz rays are a less commonly used treatment option for psoriasisrarely used today.
Treatment with Grenz rays involves exposure to low-energy (ultrasoft) X-rays.
Grenz rays are a form of black light with a very low penetration power.
Grenz is occasionally utilized to treat skin conditions that don’t fully resolve with other treatments.
Grenz treatments are not a replacement for other therapies but rather an add-on that may help deliver better results.
It is generally recommended when topical therapies, such ascorticosteroids, are unable to provide relief.
Phototherapy can be used to enhance the effects of topical therapies.
Risks and Contraindications
Most people do relatively well with phototherapy.
The current evidence, however, suggests the risk is extremely low.
To be on the safe side, healthcare providers recommend having regularskin screeningsto check for any pre-cancerous lesions.
If you have concerns about cancer, dont hesitate to discuss them with your dermatologist before treatment.
UV radiation used for phototherapy should not be confused with the ionizing radiation used forX-rays.
UV radiation mimics sunlight, while high-energy ionizing radiation can damage the DNA in cells, potentially causing cancer.
At this time, advise your healthcare provider about any and all drugs and supplements you are taking.
This includes patches, creams, and over-the-counter remedies.
Your first light therapy treatment may last only a few seconds.
Treatments rarely last longer than a few minutes.
Several treatments are usually required each week:
Treatments generally continue until your skin is clear.
Maintenance treatments are sometimes needed to prevent acute flares.
Location
Phototherapy is typically done in a dermatologists office in a 5- x 7-foot lightbox.
Home phototherapy units are also available and are typically used for maintenance.
Coal tar not only smells but can stain your clothes if you happen to get some on your hands.
A moisturizing cream can also help.
Areas that do not need treatment should be covered and protected as much as possible.
UVB treatment could involve soaking in an indoor salt bath while undergoing light exposure (calledbalneophototherapy).
The actual procedure may induce a warm sensation, similar to that of a mild sunburn.
The condition of your skin will be checked and medication recommended if you have any discomfort.
After Phototherapy
It is important to avoid natural sunlight after receiving phototherapy.
This is especially true for the first 24 hours when skin will be most inflamed.
You may also be asked to see your ophthalmologist for a follow-up examination of your eyes.
When moderate to severe psoriasis is not controlled with topical medications, light therapy may be an appropriate option.
Each has a unique treatment schedule and maintenance follow-up.
All increase the risk of sun damage immediately after treatment.
Precautionary aftercare includes avoiding sun exposure, using an oral antihistamine or steroid cream, and moisturizing frequently.
American Academy of Dermatology Association.Psoriasis treatment: Phototherapy.
InformedHealth.org [Internet].Psoriasis: Learn More Does light therapy (phototherapy) help reduce psoriasis symptoms?
Nakamura M, Farahnik B, Bhutani T.Recent advances in phototherapy for psoriasis.F1000Research.
2016;5:F1000 Faculty Rev-1684.
2020 Mar;82(3):780. doi: 10.1016/j.jaad.2019.11.024].J Am Acad Dermatol.
2019;81(3):775-804. doi:10.1016/j.jaad.2019.04.042
American Academy of Dermatology Association.Can a wearable blue-light rig clear psoriasis?
Zhang P, Wu MX.A clinical review of phototherapy for psoriasis.Lasers Med Sci.
2014;40(7):763-768. doi:10.1111/dsu.0000000000000048
American Osteopathic College of Dermatology.Grenz Rays.
Valejo Coelho MM, Apetato M.The dark side of the light: Phototherapy adverse effects.Clinics in Dermatology.
doi:10.1177/247553031500100107
National Psoriasis Foundation.Phototherapy.
2021;34(1):e14588.
Guidelines of care for the treatment of psoriasis with phototherapy and photochemotherapy.J Am Acad Dermatol.
2010;62(1):114-35. doi:10.1016/j.jaad.2009.08.026
