The BLU-U laser is used in conjunction with Levulan (delta aminolevulinic acid) to provide a treatment called Photodynamic Therapy or PDT. It is used to treat pre-malignant actinic keratoses, acne and aging skin (facial rejuvenation).
Levulan makes the skin more sensitive to the wavelength of visible light emitted by the BLU-U. Levulan is absorbed by the upper layer of skin and is broken down to protophryin IX, a precursor of red blood cells and a very potent photosensitizer. When exposed to blue light, free oxygen radicals that damage cells are released. This mechanism of action can reverse pre-malignant changes. It also kills p.acnes, the primary bacteria responsible for acne.