Blue light is designed to comfort and soothe skin. It is used clinically to treat acne. Visible red light penetrates to a depth of about 1-2 mm, and is beneficial in treating problems close to the surface and is effective at stimulating fibroblast cell activity in the skin, which increases the production of collagen and elastin – the proteins responsible for your skin's tone and elasticity. Infrared LED light produces both red and infrared wavelengths and is effective for rejuvenating aging skin.