[Importance of phototherapy in the treatment of chronic pruritus].

Phototherapy and photochemotherapy (PUVA) are important treatment modalities in inflammatory skin diseases such as psoriasis and atopic dermatitis as well as in cutaneous T‑cell lymphoma (e.g., mycosis fungoides/Sezary syndrome). Many of these skin diseases are accompanied by distracting pruritus. In addition, patients may suffer from intense pruritus in systemic diseases of the kidney and liver as well as of the endocrine and hematopoietic system. UV-light during phototherapy is capable of not only improving the inflammatory skin lesions but also of reducing the pruritus in skin and systemic diseases. The significant antipruritic effect, the usually low rate of well-known side effects, as well as the possibility to treat adults of any age, pregnant and lactating women, and under certain circumstances also children, make phototherapy a valuable treatment option for pruritus of various origin. Thus, the use of phototherapy should be considered early in the course of antipruritic therapy, when topical treatment modalities are insufficient to significantly improve pruritus.