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Phototherapy for Psoriasis: Harnessing the Power of Light
Published: Jul 01, 2024
Phototherapy is a time-tested treatment for psoriasis that uses ultraviolet light to slow skin cell growth and reduce inflammation. This article explores how phototherapy works and its role in psoriasis management.
What is Phototherapy?
Phototherapy involves exposing the skin to controlled amounts of ultraviolet (UV) light. The two main types used for psoriasis are narrowband UVB and PUVA (psoralen plus UVA). Narrowband UVB is the most common form, using a specific wavelength of UVB light. PUVA combines UVA light with a light-sensitizing medication called psoralen.
How Does Phototherapy Work?
UV light slows down the rapid skin cell growth seen in psoriasis and has anti-inflammatory effects. It's believed to work by inducing apoptosis (cell death) of T cells in psoriatic plaques and altering the expression of cytokines involved in psoriasis. This helps to clear existing plaques and prevent new ones from forming.
Benefits and Risks of Phototherapy
Phototherapy can be highly effective for many patients, often resulting in significant skin clearance. It's generally safe when administered properly and can be used long-term. However, it requires frequent treatments (usually 2-3 times per week) and can increase the risk of skin aging and skin cancer with long-term use. Short-term side effects can include redness and itching.
Who is a Good Candidate for Phototherapy?
Phototherapy is often recommended for patients with moderate to severe psoriasis who haven't responded well to topical treatments. It can be particularly effective for widespread psoriasis. However, it may not be suitable for those with a history of skin cancer or certain photosensitizing conditions. Your dermatologist will consider your overall health and psoriasis severity when recommending phototherapy.
Frequently Asked Questions
Sessions typically last only a few minutes.
Most patients need 20-36 sessions for significant improvement.
Yes, home phototherapy units are available with a doctor's prescription.
No, tanning beds are not recommended as they're less controlled and riskier.
Yes, it's often used alongside topical treatments for better results.
Illuminating Psoriasis Treatment
Phototherapy remains a valuable option in the psoriasis treatment arsenal, offering an effective non-drug approach for many patients.
References
- Elmets CA, et al. Joint AAD-NPF guidelines of care for the management and treatment of psoriasis with phototherapy. J Am Acad Dermatol. 2019;81(3):775-804.
- Mehta D, Lim HW. Ultraviolet B Phototherapy for Psoriasis: Review of Practical Guidelines. Am J Clin Dermatol. 2016;17(2):125-33.
- Wong T, et al. Phototherapy in psoriasis: a review of mechanisms of action. J Cutan Med Surg. 2012;16(1):7-18.
This article has been reviewed for accuracy by one of the licensed medical doctors working for Doctronic. Always discuss health information with your healthcare provider.
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