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See also:RINGWORM (or TINEA TONSURANS) , a disease of the See also:scalp (especially See also:common within the tropics); it consists of bald patches, usually See also:round, and varying in See also:diameter from See also:half an See also:inch up to several inches, the See also:surface showing the broken stumps of hairs and a See also:fine whitish powdering of desquamated epidermic scales . In scrofulous subjects See also:matter is sometimes produced, which forms crusts, or glues the See also:hair together, or otherwise obscures the characteristic See also:appearance . The disease is due to a See also:parasite, Trichophyton tonsurans, which exists mostly in the See also:form of innumerable spores (with hardly any mycelium), and is most abundant within the substance of the hairs, especially at their roots . If a piece of the hair near the See also:root be soaked for a See also:time in dilute liquor potassae and Dressed See also:flat under a See also:cover-See also:glass, the See also:microscope will show it to be occupied by See also:long rows of See also:minute See also:oval spores, very See also:uniform in See also:size, and each bearing a See also:nucleus . The same fungus sometimes attacks the hairs of the See also:beard, producing a 'disease called " sycosis." Sometimes it invades the hairless regions of skin, forming " tinea circinata "; circular patches of skin disease, if they be sharply defined by a margin of papules or vesicles, may be suspected of depending on the tinea-fungus . Interesting varieties of tinea are found in some of the Pacific and See also:East See also:Indian islands . Among the best remedial agents are various See also:mercurial preparations . But in See also:modern practice much success has been found in X-raying the patch in See also:order to remove the dead and diseased hairs, thus leaving a See also:free channel for the passage of antiseptic applications to the follicles . The exposures are followed by inunction of a mercurial preparation or of a lotion of See also:tincture of See also:iodine with methylated spirit . See also See also:FAVUS . |
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