Provided are a skin disease detection system and a skin disease management method using a portable terminal. The method comprises: a step in which a health management server generates skin health standard data by matching basic skin condition information with basic skin result data; a step in which the health management server receives skin condition measurement information for a skin disease of a test subject from a user terminal; and a step in which the health management server generates health result data by comparing and analyzing the skin condition measurement information on the basis of the skin health standard data, wherein the step in which the health management server generates skin health standard data by matching basic skin condition information with basic skin result data may comprise: a step in which the health management server pre-processes an image included in basic skin photographing information included in the basic skin condition information; a step in which the health management server extracts an analysis image for each site from the pre-processed image; a step in which the health management server analyzes a characteristic distribution diagram from the analysis image for each site; and a step in which the health management server quantifies and evaluates the severity of a skin disease of the test subject by using the analyzed characteristic distribution diagram.