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FEMALE VOICE: Blue light is used for acne therapy. It has two specific effects on acne. Number one, it shrinks some of the oil glands that we have in our skin, which helps improve acne over time. And the second effect it has is we have in acne lesions there are chemicals called chorafrins [phonetic] that actually react to the light. And this causes an antimicrobial effect, so it kills the bacteria that also contribute to acne. It's a great therapy and people have had great success with it. In addition, we can add a chemical called Levulan to this therapy that actually enhances that chemical that's a photo reactant and actually improve the response that patients get. In addition, blue light can be used to treat precancerous lesions called actinic keratosis. In the actinic keratosis, again, the medication that we use, the Levulan, is picked up by the actinic keratosis of the precancerous fats, both ones we can see clinically and it also picks up ones that we can't see clinically. This results, again, in the same interaction with the light and actually kills those precancerous lesions. Oftentimes we do this in a series of two to three treatments to help clear up all of the precancerous lesions a patient has, but sometimes depending on the patient's skin, they may need less or more treatments. A lot of times, we'll see people back in the clinic - - make that decision on an individual basis.