What is phototherapy for psoriasis?
Phototherapy, also called light therapy, is a treatment that exposes your skin to specific wavelengths of ultraviolet (UV) light to help clear psoriatic lesions. It works by reducing inflammation and slowing down the overproduction of skin cells that characterizes psoriasis.
Between 50% Show Full Answer
What is phototherapy for psoriasis?
Phototherapy, also called light therapy, is a treatment that exposes your skin to specific wavelengths of ultraviolet (UV) light to help clear psoriatic lesions. It works by reducing inflammation and slowing down the overproduction of skin cells that characterizes psoriasis.
Between 50% and 90% of people with psoriasis who undergo light therapy experience noticeable improvement in their symptoms, and in some cases, symptoms go away entirely. Types of phototherapy available:
- Narrowband UVB: The most common type, requiring fewer treatments per week than older broadband UVB
- Excimer laser: Targeted therapy for specific areas like plaque psoriasis, sparing healthy skin
- PUVA: Combines psoralen medication with UVA light (second-line treatment)
- Balneophototherapy: Combines salt water baths with UV light exposure
Narrowband UVB and excimer laser are considered first-line therapies for plaque psoriasis. At-home vs. clinic-based treatment:
Recent research found that 33% of people using at-home phototherapy achieved clear or almost-clear skin after 12 weeks, compared to 26% with in-office treatment. At-home users were also more likely to stick with treatment (51% vs. 16%) and reported better quality of life.
Your dermatologist can prescribe either clinic-based treatment or provide an at-home unit. At-home units are especially helpful if you don't live near a treatment center or face scheduling challenges. Important considerations:
Treatment typically requires 3 sessions per week for 4 weeks to 3 months. Phototherapy works best when combined with other psoriasis treatments.
Potential side effects include:
- Short-term: itching, pain, blistering, burning sensation
- Long-term: skin pigmentation changes, premature aging, increased skin cancer risk, cataracts
Avoid phototherapy if you're pregnant, have light sensitivity, or take medications that increase sun sensitivity. Regular dermatologist check-ups are essential during treatment.
Note: Tanning beds are NOT recommended as they primarily emit UVA light (not the more beneficial UVB) and carry similar cancer risks without the therapeutic benefits.
April 6
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