A member asked:

How effective is phototherapy in treating psoriasis?

2 doctors weighed in across 2 answers

Varies: In stable plaque psoriasis phototherapy can flatten psoriasis and put into remission for about 9 months. It will require a series of 20-30 treatments. Home narrow band uvb devices are available for home use and can be covered by insurance but will require documentation by a dermatologist.

Answered 10/3/2011

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Dr. Arlo Miller answered

Specializes in Dermatology

Very: Most psoriasis patients respond very well to phototherapy. If you get better with sunlight, it is very likely that phototherapy will lead to substantial improvement. Phototherapy is my favorite treatment when psoriasis can't be controlled with topical medicines.

Answered 2/10/2013

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