Light therapy (Phototherapy)
Approximately 80% of people with psoriasis notice an improvement in their skin after spending time in the sun. Light therapy involves exposing the skin to one of the two types of the sun’s ultraviolet light under medical supervision. The treatments are given up to three times per week in a clinic, and may take up to 30 sessions before positive improvements are seen.
PUVA therapy combines ultraviolet A (UVA) light present in sunshine with a psoralen, a medication that sensitizes the skin to UVA and makes treatment more effective. The psoralen can be taken as a tablet or in a bath-soak prior to therapy.
Treatment with ultraviolet B (UVB) involves exposing the skin to an artificial UVB light source for a set period of time on a regular basis, under a doctor's supervision in a clinic.