It requires the application to the affected area of Amino Levulinic Acid (ALA), which is then absorbed into the skin. After absorption the area is exposed to pure red light, which activates the ALA to destroy the skin cancer. This is repeated seven days later.
Although some warmth is experienced, very few people have any other sensation during treatment. After treatment rarely blistering or redness may occur and this usually subsides in 24 hours.
There is no scarring and research shows an efficacy of 91-98%.