Psoralens and ultraviolet A therapy of pityriasis lichenoides.

Three patients with long-standing pityriasis lichenoides, which was resistant to other forms of therapy, were successfully treated with PUVA (psoralens and ultraviolet light of wavelength A). One patient had complete clearing of all lesions, and the other two had marked improvement. PUVA is being used to treat increasing numbers of patients with pityriasis lichenoides, and the results have been very good.