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This AAD.org paper offers relief for many skin problems:

Photodynamic therapy, or PDT, is a non-invasive treatment which uses laser or light energy to activate a photosensitizer or photosensitizing agent - applied topically to the skin prior to treatment - known as aminolevulinic acid (ALA). In her study comparing the efficacy of three different light sources - blue light, pulsed light plus radiofrequency, and intense pulsed light - used in PDT to activate the ALA, Dr. Taub reported that the majority of the 19 study patients showed improvement in their acne following three treatments administered two weeks apart with each of the variable light sources. However, the patients randomly selected for treatment with the intense pulsed light laser demonstrated the most improvement - approximately 70 percent of their acne cleared three months following treatment.