The BLU-U^® 4170 offers effective, non-invasive and pain-free blue light treatment for moderate inflammatory acne vulgaris, a condition affecting millions of adults, teens and children in the United States. Narrow band blue light causes a photodynamic effect within the pylosebaceous gland that kills P. acnes, the bacteria primarily responsible for acne vulgaris. Treatments may be performed up to 2-3 times weekly to achieve maximum results. Sessions are quick, pain free and require no down time. Blue light therapy is also used during photodynamic therapy (PDT) to treat sun damage and superficial skin cancers. Please refer to our PDT link for more information!