Microsprum is a genus of dermatophytes causing microbial mycosis. Small-spore mycosis is an infectious disease of the scalp. In Poland, it is most often caused by Microsporum canis , a fungus transmitted by cats and dogs. Infections occur primarily in children and they have the nature of skin peels. The characteristic symptom is the presence of oval foci with hair broken evenly at a height of 2-3 mm above the skin surface. The skin in the foci of infection usually shows no signs of inflammation.