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[Physical and biological principles of the use of lasers in dermatology (author's transl)].

A description of the principle of laser is followed by indicating the specific characteristics of laser light. The biological and physical influences of light are mentioned slightly. Using the laser in medicine primarily means to utilize the thermcal effect of radiation. This effect results both from the parameters of irradiation and thermcal and optical characteristics (absorption and diffraction) of the tissue. The possibilities of employing different systems of laser in dermatology - surgical operations, treatment of skin lesions and light-induced wound healing - are discussed.