Phototherapy and photochemotherapy in dermatologic diseases.

Phototherapy and photochemotherapy have been shown to be effective treatments in a number of cutaneous disorders, but they are not without risk. PUVA has revolutionized the treatment of psoriasis and stimulated major improvements in the administration of UVB therapy. Successful treatment depends on careful patient selection and evaluation. Accurate dosimetry and close supervision are necessary to avoid complications. Regular and careful follow-up, both during and after therapy, can help to identify and treat long-term side effects such as non-melanoma skin cancers. In order to achieve the necessary balance between benefits and risks with these valuable forms of therapy, patients should be referred to dermatologists with special training.