, rounded,
or ovalish vesicles or blebs, soon becoming vesico-pustular, and drying
to thin yellowish crusts.

#Upon what parts does the eruption commonly appear?#

Upon the face, scalp, and hands, and exceptionally upon other regions.

#Describe the symptoms of impetigo contagiosa.#

One, several or more small pin-head-sized papulo-vesicles or vesicles
make their appearance, usually upon the face and fingers. In the male
adult the region of the neck and beard is a favorite situation. They
increase in size by extending peripherally, but are more or less
flattened and umbilicated, and are without conspicuous areola. The
lesions may attain the size of a dime or larger, and when close together
may coalesce and form a large patch. In some cases distinct blebs
result, and a picture of pemphigus eruption presented; it is probable
that many of the cases of "contagious pemphigus" belong to this class.
New lesions may appear for several days, but finally, in the course of a
week or ten days, they have all dried to thin, wafer-like crusts, of a
straw or light-yellow color, but slightly adherent, and appearing as if
stuck on; these soon drop off, leaving faint reddish spots, which
gradually fade. In some cases there is so decided a tendency to clear
and dry up centrally while spreading peripherally that the eruption has
a ring-like aspect; this seems especially so in the bearded region of
the male adult.

Instead of presenting as described, it may occur as one or more pea- or
finger-nail-sized, rounded and elevated, usually firm, discrete
pustules, scattered over one part, or more commonly over various
regions, such as the face, hands, feet and lower extremities. The
pustules are such from the beginning, and when developed are usually of
the size of a pea or finger-nail, elevated, semi-globular or rounded,
with somewhat thick and tough walls, and of a whitish or yellowish
color; at first there may be a slight inflammatory areola, but as the
lesion matures this almost, if not entirely, disappears. The pustules
show no disposition to umbilication, rupture or coalescence; drying in
the course of several days or a week to yellowish or brownish crusts,
which soon drop off, leaving no permanent trace. This variety was
formerly thought to be a distinct disease, and was described under the
name of _impetigo simplex_.

As a rule there are no constitutional symptoms, but in the more severe
cases the eruption may be preceded by feb