Intense pulsed light (IPL) is a cosmetic skin treatment. People may use it to reduce the signs of aging or remove unwanted hair. Other uses include reducing the appearance of scars, lightening darker patches of skin, and improving the appearance of spider veins. IPL works in a similar way to laser therapy. The difference is that where laser therapy delivers a single wavelength of light energy, IPL delivers multiple wavelengths. This means that IPL can treat a larger area of skin in a shorter time than laser therapy.