the causative factor.

#What is the pathology of xanthoma?#

It is a benign, connective-tissue new growth, with concomitant or
subsequent, but usually partial, fatty degeneration.

#Give the prognosis of xanthoma.#

The condition is persistent, and usually irresponsive to all treatment
save destructive or operative measures.

#What is the treatment of xanthoma?#

Treatment consists, in suitable cases, of excision; in some instances,
electrolysis is serviceable. Applications of trichloracetic acid
cautiously made are sometimes of value. In that form of general xanthoma
due to diabetes the treatment of this latter condition will materially
and sometimes completely remove the eruption.

#Myoma.#
(_Synonyms:_ Myoma Cutis; Dermatomyoma; Liomyoma Cutis.)

#Describe myoma.#

The disease is rare, and consists usually of one or several
(exceptionally numerous), variously-sized tumors of the skin, made up of
smooth muscular fibres. They are flat, rounded, oval or pedunculated,
and have a smooth surface and a pale-red color; as a rule, they are
painless.

The growth is benign, and consists essentially of a new formation of
unstriped muscular fibres; but it may also be composed largely of
connective tissue (_fibromyoma_); or it may contain an abundance of
bloodvessels (_myoma telangiectodes_, _angiomyoma_); or there may be
lymphatic involvement (_lymphangiomyoma_).

#Angioma.#
(_Synonyms:_ Naevus Vasculosus; Naevus Sanguineus.)

#Give a definition of angioma.#

Angioma is a congenital hypertrophy of the vascular tissues of the
corium and subcutaneous tissue. Exceptionally it makes its appearance a
few weeks or a month after birth.

#Into what two classes may angiomata be roughly grouped?#

The flat (or non-elevated) and the prominent (or elevated).

#Describe the flat, or non-elevated, variety of angioma.#

The flat, or non-elevated, angioma (_naevus flammeus_, _naevus simplex_,
_angioma simplex_, _capillary naevus_) may be pin-head- to bean-sized; or
it may involve an area of several inches in diameter, and, exceptionally,
a whole region. It is of a bright- or dark-red color, and is met with
most frequently about the face. In some instances it extends after birth,
reaches a certain size and then remains stationary; occasionally, when
involving a small area, it undergoes involution and disappears.

The so-called _