#State frequency and types of eruption resulting from the administration
of turpentine.#

Not uncommon. _Erythematous_, and small-papular; exceptionally
vesicular.

#X-Ray Dermatitis.#

#What several grades of x-ray dermatitis (x-ray burns, Rontgen-ray burns)
are observed?#

Three grades are usually described: erythema, superficial vesication,
and necrosis. The first and second may come on shortly--a few hours to
several days--after exposure; occasionally later. The third grade may
present also in the first several days, but in many cases one to several
weeks may elapse before it appears; it is quite commonly preceded by
erythema and vesication. The necrosis may be superficial or deep, and
quite usually results in a persistent ulcer covered by a leathery
coating; it is usually painful.

[Illustration: Fig. 15. _x_-ray burn]

#Give the prognosis and treatment of x-ray dermatitis.#

The first grade--the erythematous--usually disappears in one to ten
days; the second grade requires one to several weeks, and may be quite
sore and tender; the severe or necrotic burns are persistent, sometimes
lasting for months and several years, with little tendency to
spontaneous disappearance, and rebellious to treatment.

Treatment of the milder types is that of erythema (_q. v._); the necrotic
type occasionally demands thorough curetting and skin-grafting before it
will heal.

#Dermatitis Factitia.#
(_Synonym:_ Feigned Eruptions.)

#What do you understand by feigned eruptions?#

Feigned, or artificial, eruptions, occasionally met with in hysterical
females and in others, are produced, for the purpose of exciting
sympathy or of deception, by the action of friction, cantharides, acids
or strong alkalies; the cutaneous disturbance may, therefore, be
erythematous, vesicular, bullous, or gangrenous. It is usually limited
in extent, and, as a rule, seen only on parts easily reached by the
hands.

[Illustration: Fig. 16.
Dermatitis Factitia--note the unusually uniform and regular character
and arrangement of the lesions.]

#Dermatitis Gangraenosa.#

#What do you understand by dermatitis gangraenosa?#

Dermatitis gangraenosa (_erythema gangraenosum_, _Raynaud's disease_,
_spontaneous gangrene_) is an exceedingly rare affection, characterized
by the formation of gangrenous spots and patches. It may be idi