Treatment varies from patient to patient depending on the type of lesion, size of the affected area, color of the patient’s skin and depth to which the abnormal pigment extends beneath the surface of the skin. Some lesions, such as “age spots,” will require only a few pulses, while others, such as café au lait birthmarks, will require more. Some lesions require re-treatment, necessitating multiple patient visits. Specially filtered bands of light target the melanin in pigmented lesions, where the light is converted into heat. This heating selectively destroys the pigmented lesion, which is sloughed away, clearing the lesion within two weeks.