An American text-book of genito-urinary diseases, syphilis and diseases of the skin . entire in favus. Greater difficulty is expe-rienced after the disease has existed a long time, and the scalp presents thepatchy aspect as if the hair has been unskilfully cut. Nor will the micro-scope always clear up the diagnosis between these two affections, for indetached specimens, where the relative position of the fungus is deranged,there is nothing distinctive in the appearance of the fungi themselves. Butin the arrangement and position of the parasites there are certain points thatshould be noted. Thu
An American text-book of genito-urinary diseases, syphilis and diseases of the skin . entire in favus. Greater difficulty is expe-rienced after the disease has existed a long time, and the scalp presents thepatchy aspect as if the hair has been unskilfully cut. Nor will the micro-scope always clear up the diagnosis between these two affections, for indetached specimens, where the relative position of the fungus is deranged,there is nothing distinctive in the appearance of the fungi themselves. Butin the arrangement and position of the parasites there are certain points thatshould be noted. Thus the trichophyton and microsporon never form accu-mulations, such as the favic scutula. In ringworm the spores are found inabundance, either permeating the cuticle of the hair, extending high up, orforming the so-called spore-sheath around the shaft, while in favus themycelia are more numerous and the spores are confined to the lower partof the shaft, extending downward into the follicle. The history may fur-1 Lot. cit. 2 Turner: A Treatise on Diseases of the Skin, London, ifff/7 Fig. 281.—Hair in tinea tonsurans, showingupper part of root and broken end of shaft justabove follicular opening: a, spore-sheath. TINEA TONSURANS. 1167 nish a clue, for tinea trichophytina yields more readily to treatment, is decid-edly contagious, and is endemic in the United States, while favus is an im-ported affection. Seborrhcea sicca also presents scaly surfaces, with the nutrition of thehair impaired, but it is usually seen after puberty, while ringworm is, for themost part, a disease of childhood. Again, seborrhea is more widely dis-tributed and rarely confined to circumscribed patches; the scales are oftenoily; the hair, though often dull, has not the broken, bent, and washed-outlook of ringworm. In all cases of doubt the microscope should be used. Eczema Squamosum.—When much inflammation of the patches exists,either from a peculiarly susceptible skin or from too strong applicati
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