About 50%
of these tumours arise
from
a
pre-existing junction naevus
and
50% from apparently normal skin.
They do not, occur
before puberty. Signs of
commencing malignancy in a
pre-existent mole are sudden
spread, especially with a
halo of pigmentation outside the
lesion,
darkening in colour, irritation
or friability. A
malignant melanoma arising
in normal skin is usually
a
glistening, jeb black colour, but
can occasionally be
skin coloured.
Treatment
Junction naevi should
either be left alone
or completely excised. Treatment
is indicated either for
cossmetic
reasons
or if a lesion
is subjected to constant, irritation,
for instance when it is
on the hands or
feet or on the trunk
under a belt, braces
or other constriction. Dermal
naevi may be treated by
any means. small ones
may be removed by electrolysis,
electrocautery or excision.
Raised non-pigmented moles can be
satisfactorily dealt with
by slicing them off level with
the skin under a local anaesthetic,
the bleeding being stopped by
pressure or touching with the
electrocautery. Hairy moles should be excised and the defect repaired by graft.
Senile lentogo
should not be treated unless malignancy super venes and then no more than local
excision is necessary.
No comments:
Post a Comment