Dermatoscope consists of a strong magnifying lens powered with a bright illumination source; this source can be either a halogen lamp or a light emitting diode (LED). When light falls on the stratum corneum, it is reflected and refracted reducing the visibility of underlying structures. This scattering of light is overcome by polarized light in polarized dermatoscope, and contact fluid in nonpolarized dermatoscope allowing the visualization of subsurface skin structures in the epidermis, dermoepidermal junction, and upper dermis. There are three types of dermatoscopes which are nonpolarized, polarized, and hybrid. All these three types are defined in this chapter.