or, more commonly, days
gradually disappear. The itching is intense, and in consequence their
apices are excoriated. Sometimes the papules are capped with a small
vesicle (vesicular urticaria). It is seen more particularly in ill-cared
for and badly-nourished young children.

#Describe urticaria haemorrhagica.#

Urticaria haemorrhagica is characterized by lesions similar to ordinary
wheals, except that they are somewhat hemorrhagic, partaking, in fact,
of the nature of both urticaria and purpura.

#Describe urticaria tuberosa.#

In urticaria tuberosa the lesions, instead of being pea- or bean-sized,
as in typical urticaria, are large and node-like (also called _giant
urticaria_).

#What is acute-circumscribed [oe]dema?#

In rare instances there occurs, along with the ordinary lesions of the
disease or as its sole manifestation, sudden and evanescent swelling of
the eyelids, ears, lips, tongue, hands, fingers, or feet (_urticaria
[oe]dematosa_, _acute_ _circumscribed [oe]dema_, _angioneurotic [oe]dema_).
One or several of these parts only may be affected at the one attack; in
recurrences, so usual in this variety, the same or other parts may
exhibit the manifestation.

(These [oe]dematous swellings occurring alone might be looked upon, as
they are by most observers, as an independent affection, but its close
relationship to ordinary urticaria is often evident.)

#Describe urticaria bullosa.#

Urticaria bullosa is a variety in which the inflammatory action has been
sufficiently great to give rise to fluid exudation, the wheals resulting
in the formation of blebs.

#What is the etiology of urticaria?#

Any irritation from disease, functional or organic, of any internal
organ, may give rise to the eruption in those predisposed. Gastric
derangement from indigestible or peculiar articles of food, intestinal
toxins, and the ingestion of certain drugs are often provocative. The
so-called "shell-fish" group of foods play an important etiological part
in some cases. Idiosyncrasy to certain articles of food is also
responsible in occasional instances. Various rheumatic and nervous
disorders are not infrequently associated with it, and are doubtless of
etiological significance. External irritants, also, in predisposed
subjects, are at times responsible.

#What is the pathology of urticaria?#

Anatomically a wheal is seen to be a more or less firm elevation
consisting of a circumscribed or somewhat diffu