Upon non-hairy parts, such as the face, neck, hands, and trunk, ringworm begins as a minute, slightly reddened, scaly disc, which gradually enlarges. When it has reached the size of a ten-cent piece the advancing border appears elevated while the centre tends to become smoother, and the lesion presents an oval, circinate. or "ring"-like appearance (Fig. 5). In rare cases a circle of fine vesicles can be detected at the periphery. One or more rings may be present, and the coalescence of two
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Fig. 5.—Trichophytosis corporis.
or more may produce an irregular patch like a figure of eight or a trefoil. Occasionally when the ring has attained considerable size red papules or new foci of disease may appear in the smooth and perhaps slightly pigmented centre, and by gradual development may produce two or even more concentric rings.
Favus developing upon non-hairy parts produces scaly discs which at first are not readily distinguishable from the lesions of ringworm; but soon upon the branny surface a minute yel-
