Pignot. Ringworm symptomatology and therapy. Presse Med., No. 20, 10.III 1937)

To better see the diseased hair, you need to put your head between the shadow and the light so that the latter glides over it. Sometimes the hair that is affected by shingles is hidden under crusts. These scabs make it easier to find affected hair. With a microsporion, the hair appears to be covered with frost, with an endosporion, it looks like a comma, its fragments are deeply embedded in a thick crust. These signs relate to an already developed disease. A hair affected by microsporion looks like a glass rod dipped in glue and dumped in the sand under the microscope. With endotrichophytosis, it is all permeated with spore filaments, resembling a bag filled with nuts, and the parasite does not spread beyond the epidermis of the hair shaft. With kerion, parasites are found that are very reminiscent of microsporion, but they are even smaller, which is why they were called microids. As with microsporion, they form, as it were, a case around the hair with the only difference that here the spores lie in the form of threads, and not in the form of a mosaic. In much rarer cases, there are parasites of the endo-exotrix type, which fill the interior of the hair and at the same time go beyond the epidermis, forming around it, as it were, a case of very large spores (megaspores).