t is known in regard to the etiology?#

The affection is closely allied to erythema multiforme, and is, indeed,
by some considered a form of that disease. It occurs most frequently in
children and young adults, and usually in the spring and autumn months.
Intestinal toxins are thought responsible in some cases. Digestive
disturbance and rheumatic pain and swellings are often associated with
it. By many the malady is thought to be a specific infection.

#What is the pathology of erythema nodosum?#

The disease is to be viewed as an inflammatory [oe]dema, probably
resulting, in some instances at least, from an inflammation of the
lymphatics or an embolism of the cutaneous vessels.

#What diseases may erythema nodosum resemble?#

Bruises, abscesses, and gummata.

#How are the lesions of erythema nodosum to be distinguished from these
several conditions?#

By the bright red or rosy tint, the apparently violent character of the
process, the number, situation and course of the lesions.

#State the prognosis of erythema nodosum.#

Favorable, recovery usually taking place in ten days to several weeks.

#State the treatment to be advised in erythema nodosum.#

Rest, relative or absolute, depending upon the severity of the case, and
an unstimulating diet; internally intestinal antiseptics, quinin and
saline laxatives, and locally applications of lead-water and laudanum.

#Erythema Induratum.#
(_Synonym:_ Erythema induratum scrofulosorum.)

#What do you understand by erythema induratum?#

A rare disease characterized in the beginning by one or more usually
deep-seated nodules, and, as a rule, seated in the legs, especially the
calf region. The nodules gradually enlarge, the skin becomes reddish,
violaceous or livid in color. Absorption may take place slowly, or the
indurations may break down, resulting in an indolent, rather deep-seated
ulcer, closely resembling a gummatous ulcer. The disease is slow and
persistent, and is commonly met with in girls and young women, usually
of strumous type. It suggests a tuberculous origin.

Treatment consists in administration of cod-liver oil, phosphorus and
other tonics. Rest is of service. Locally antiseptic applications, and
support with roller bandage are to be advised.

#Urticaria.#
(_Synonyms:_ Hives; Nettlerash.)

#Give a definition of urticaria.#

Urticari