and severe grade of the
disease. The division is, to a great extent, an arbitrary one.

#Describe the clinical appearance and course of an individual lesion of
purpura.#

The spot, which may be pin-head, pea-, bean-sized or larger, appears
suddenly, and is of a bright red or purplish red color. Its brightness
gradually fades, the color changing to a bluish, bluish-green, bluish-
or greenish-yellow, dirty yellowish, yellowish-white, and finally
disappearing; varying in duration from several days to several weeks.

#Describe the symptoms of purpura simplex.#

Purpura simplex, or the mild form, shows itself as pin-point to pea- or
bean-sized, bright or dark-red spots, limited, as a rule, to the limbs,
especially the lower extremities; fading gradually away and coming to an
end in a few weeks, or new crops appearing irregularly for several
months. There is rarely any systemic disturbance, and, as a rule, no
subjective symptoms; in exceptional cases an urticarial element is
added--_purpura urticans_.

#Describe the symptoms of purpura rheumatica.#

Purpura rheumatica (also called _peliosis rheumatica_) is usually
preceded by symptoms of malaise, rheumatic pains and sometimes
swelling about the joints; these phenomena abate and frequently disappear
upon the outbreak of the eruption. The lesions are pea- to dime-sized,
smooth, non-elevated, or slightly raised, and of a reddish or purplish
color; the eruption may be more or less generalized, most abundant upon
the limbs, or it may be limited to these parts. It may end in a few weeks,
or may persist for several months, new spots appearing irregularly or in
the form of crops.

As somewhat allied to this is another form (_Schoenlein's disease_),
quite alarming in its symptoms. It is rare. It is characterized by
symptoms partaking of the nature of rheumatism, purpuric spots, blotches
and ecchymoses, erythema multiforme, and often associated with
considerable edema. The throat is also usually invaded, and indeed the
first symptom is commonly in this region. Considerable constitutional
disturbance, of a threatening character, is commonly observed. Recovery
usually takes place.

_Henoch's purpura_, observed chiefly in children, resembles the above,
with the erythema multiforme character and the [oe]dematous swellings
more pronounced, while the actual purpuric symptoms are less
conspicuous. Gastric and intestinal symptoms and hemorrhages from the
mucous membrane are com