A dermal image information processing device includes a memory; and a hardware component that reads data from the memory and performs: acquiring dermal image information showing ridge lines in a papillary layer; detecting an singular region caused by a surgical operation in the dermal image; determining a type of the surgical operation that is a cause of generation of the singular region; generating a repaired image showing ridge lines in a papillary layer prior to the surgical operation, based on the type of the surgical operation; and collating the repaired image with a pre-registered dermal image.