Light therapy using ultraviolet light
can help. PUVA, UVB, and Narrow Band
UVB are all used. Current research
seems to show that Narrow Band UVB is
the most effective, in addition to
having lowest risk of skin
cancer.
When light therapy alone is found to
be ineffective, it is combined with a
drug called Psoralen. This treatment is
termed as photo-chemotherapy.

