A device for evaluating the microcirculation of blood in human or animal tissue. The device having a housing with an open end for contact with said tissue and thus delimit a study area of said tissue. The device including a light-emission means toward the study area, image-acquisition means of the study area, compression means of at least one determined zone inside the study area, control means controlling the application of said controlled pressure to said zone, then removal of said controlled pressure and image acquisition on said study area exposed to said light, data-processing means using the images acquired to calculate at least one parameter relative to the discoloration and/or the recoloration of said tissue. The compression means calibrated to apply controlled pressure to said zone and retractable to leave said compression zone and/or said study area accessible to said light and/or to the image-acquisition means.