Abstract: The invention relates to a method for treating skin diseases using live “Penicillium notatum” fungus. There is still little known about the “Penicillium notatum” fungus. Live “Penicillium notatum” fungus has the following functions in the treatment process: 1) as a biological producer to develop the most effective antibiotic against (particular) pathological microorganisms acting as the causative agents of a particular disease; 2) as a biological therapeutic instrument for the rational delivery of an antibiotic individually to each pathogenic microorganism; 3) as a biological instrument for the removal of dead and infected human body tissues; 4) as a biological immunizing agent protecting young regenerating skin; 5) as a biological immunizing agent protecting young skin tissue that has not succeeded to establish immunity after regeneration against a repeated attack from the disease. The treatment period for certain infectious skin diseases using live “Penicillium notatum” fungus lasts from three to five days.