Photodynamic therapy involves BBL (BroadBand Light), which uses light energy to gently heat your upper layers of skin. The heat stimulates your skin cells, regenerates new collagen, and restores the treatment area, resulting in smoother, vibrant, and younger-looking skin. BroadBand Light can be used safely and effectively on the face, neck, chest, and the rest of the body. It is also used to treat brown spots, age spots, red spots, hyperpigmentation, facial spider veins, and even acne scars.