Device for laser removal of a tattoo or a scar extending along a pre-defined skin area, comprising: a skin treatment multi-laser exchangeable head having at least one laser beam target line, and a robotic support for supporting said laser head; further comprising, attached to the exchangeable multi-laser head or to the robotic support where the exchangeable multi-laser head is supported: a multispectral camera for capturing skin surface images having plurality of ranges of colour wavelength of the skin surface image, each range corresponding to a laser of the exchangeable multi-laser head, a mechanism configured to automatically exchange the laser head for changing between laser beams of the exchangeable multi-laser head, a robotic arm comprising fibre optics; one or more handles for handling by the operator, a force sensor for sensing the intensity and direction of force applied to the handle or handles by the operator for controlling the robotic support, and an electronic data processor configured for carrying out the steps comprising: capturing an image of skin surface comprising the tattoo to be removed, by the multispectral camera; segmenting the captured image according to the plurality of ranges of colour wavelength by dividing said capture image according to each range of colour wavelength; defining a path from each said segmented captured image, said path comprising a plurality of path segments wherein each path segment corresponds to a colour wavelength range; selecting each path segment from the plurality of defined path segments; selecting the laser of the exchangeable multi-laser head according to the colour wavelength corresponding to each selected path segment; removing the tattoo or the scar by receiving a user trigger input for shooting the exchangeable multi-laser head into a laser spot regularly spaced along each selected path segment. a skin treatment multi-laser exchangeable head having at least one laser beam target line, and a robotic support for supporting said laser head; a multispectral camera for capturing skin surface images having plurality of ranges of colour wavelength of the skin surface image, each range corresponding to a laser of the exchangeable multi-laser head, a mechanism configured to automatically exchange the laser head for changing between laser beams of the exchangeable multi-laser head, a robotic arm comprising fibre optics; one or more handles for handling by the operator, a force sensor for sensing the intensity and direction of force applied to the handle or handles by the operator for controlling the robotic support, and an electronic data processor configured for carrying out the steps comprising: capturing an image of skin surface comprising the tattoo to be removed, by the multispectral camera; segmenting the captured image according to the plurality of ranges of colour wavelength by dividing said capture image according to each range of colour wavelength; defining a path from each said segmented captured image, said path comprising a plurality of path segments wherein each path segment corresponds to a colour wavelength range; selecting each path segment from the plurality of defined path segments; selecting the laser of the exchangeable multi-laser head according to the colour wavelength corresponding to each selected path segment; removing the tattoo or the scar by receiving a user trigger input for shooting the exchangeable multi-laser head into a laser spot regularly spaced along each selected path segment. capturing an image of skin surface comprising the tattoo to be removed, by the multispectral camera; segmenting the captured image according to the plurality of ranges of colour wavelength by dividing said capture image according to each range of colour wavelength; defining a path from each said segmented captured image, said path comprising a plurality of path segments wherein each path segment corresponds to a colour wavelength range; selecting each path segment from the plurality of defined path segments; selecting the laser of the exchangeable multi-laser head according to the colour wavelength corresponding to each selected path segment; removing the tattoo or the scar by receiving a user trigger input for shooting the exchangeable multi-laser head into a laser spot regularly spaced along each selected path segment.