[header] How to treat psoriasis with phototherapy [title] Try uvb phototherapy. [step] There are two different types of ultraviolet b (uvb) phototherapy, home and clinical. Uvb phototherapy is undergone when the light penetrates the skin, which slows down the growth of the skin cells. 
Whether it is done at home or in a clinic, uvb phototherapy is given for specified periods of time and on a regular schedule. [substeps] The specific time periods and your schedule for this treatment depend on how extensive your psoriasis is and the specific areas of your body that are affected.