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The selective photo-thermal melting is the phenomenon that, for example, when the light whose wavelength is well absorbed into the melanin pigment is irradiated to the melanin pigment lesion, the increased melanin pigment in the lesion absorbs the light and generates heat. As the melanin pigment is destroyed by this light and other sections are not relatively reacted to this light, heat is not generated. Only the melanin pigment is destroyed and the surrounding skin tissue is safe. IPL(Intense Pulsed Light) is the device of broadly filtering and using only the necessary part of the whole wavelength for the target lesion.