Currently lasers are used to destroy Birthmark and Lentigo in clinics of dermatology and plastic surgery . The aim of laser therapy is to destroy the target ce11s and not to harm the surrounding tissue . We have developed a new type of laser apparatus for removing only the pigmented lesions with laser scanning technology , The effects of a Nd :YVO4 1aser( 1064 nm )with a laser spot size of 30 μ m 三 n diameter was investigated by experiments with rats , As a result , the pigmented lesions were able to be removed but some scar tissues were formed . The thermometry during the laser irradiation was performed with an infrared thermal imaging camera . It was found that the temperature rise by laser irradiation reached the temperamre that was high enough to cause a bum . Thus, to resolve this problem a new irradiation method in which the focused laser beam was scanned with each laser line 150 μ m apart was proposed .
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