Favus - fungic disease of a skin, hair and the fingernails, differing long current. The originator - Tr. Schirnleinii, amazes a false skin (usually cornual layer), can get into a derma, probably hematogenic diffusion. The contageousness is insignificant. A source - the sick person. Transfer of a mycosis occurs more often at children's age, at close and long family contact. The contributing factor - weakening of an organism as a result of chronic diseases, a various sort of an intoxication, a defective and insufficient delivery. Meets at any age.

The amazed hair become thin, dry, dim and as though dusty, however they do not break off and keep the length. On a smooth skin which lesion meets seldom and usually it is combined with a lesion of a head, precisely circumscribed erythematic squamous, slightly inflamed maculae usually wrong outlines on which background small formations can be formed settle down. The cicatrical atrophy does not arise. The lesions of internal organs leading a lethal outcome are known.