When unstable oxygen compound O3 dissociates ultraviolet irradiation is formed. This irradiation affects the epidermis and deeper layers of the skin, what promotes the production of protective substances, hormones and vitamins, and in addition it has the ability to kill bacteria. This type of therapy is most commonly used to treat psoriasis, atopic dermatitis, vitiligo, and mycosis fungoides.





Efficacy of the treatments with ultraviolet rays

UV treatment effectiveness on different data amounts to 80%.  Regression of lesionsobserved already after the first treatment, remission ranging from six months to several years.   
In therapy with ultraviolet rays, as well as other methods of phototherapy, there is no effect of habituation, which means high effectiveness of repeated courses of treatment. However, it should be noted that this type of therapy may require treatment in the maintenance of the regime in order to maintain remission and response of individual lesions.