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The initial lesions of the exanthem are dense and deeply-set papules, so closely coherent even at this moment that they scarcely leave between them interspaces of sound skin.

Uncomplicated measles too, generally runs its course with a marked leukopenia, specially distinct during the breaking out and at the height of the exanthem.

The dermal manifestations, such as urticaria and eruptions resembling the exanthem of scarlatina, are too well known to need mention here.

In many, even the majority, of cases the exanthem is much less profusely developed, not more than a dozen or twenty vesicles springing from the surface.

On the other hand, some maladies occurring in connection with this exanthem do not change its symptoms, but themselves undergo modification.