to, they may be painted night and morning with salicylic
collodion, the epidermis being dehydrated with alcohol before each
application.

_Venereal warts_ occur on the genitals of either sex, and may form large
cauliflower-like masses on the inner surface of the prepuce or of the
labia majora. Although frequently co-existing with gonorrhoea or
syphilis, they occur independently of these diseases, being probably
acquired by contact with another individual suffering from warts
(C. W. Cathcart). They give rise to considerable irritation and
suffering, and when cleanliness is neglected there may be an offensive
discharge.

In the female, the cauliflower-like masses are dissected from the labia;
in the male, the prepuce is removed and the warts on the glans are
snipped off with scissors. In milder cases, the warts usually disappear
if the parts are kept absolutely dry and clean. A useful dusting-powder
is one consisting of calamine and 5 per cent. salicylic acid; the
exsiccated sulphate of iron, in the form of a powder, may be employed in
cases which resist this treatment.

#Adenoma.#--This is a comparatively rare tumour growing from the glands
of the skin. One variety, known as the "tomato tumour," which apparently
originates from _the sweat glands_, is met with on the scalp and face in
women past middle life. These growths are often multiple; the individual
tumours vary in size, and the skin, which is almost devoid of hairs, is
glistening and tightly stretched over them. A similar tumour may occur
on the nose. The _sebaceous adenoma_, which originates from the
sebaceous glands, forms a projecting tumour on the face or scalp, and
when the skin is irritated it may ulcerate and fungate. The treatment
consists in the removal of the tumour along with the overlying skin.

The exuberant masses on the nose known as "rhinophyma," "lipoma nasi,"
or "potato nose" are of the nature of sebaceous adenoma, and are removed
by shaving them off with a knife until the normal shape of the nose is
restored Healing takes place with remarkable rapidity.

#Cancer.#--There are several types of primary cancer of the skin, the
most important being squamous epithelioma, rodent cancer, and melanotic
cancer.

[Illustration: FIG. 101.--Paraffin Epithelioma.]

#Epithelioma# occurs in a variety of forms. When originating in a small
ulcer or wart-for example on the face in old people--it presents the
features of a chronic indurated ulcer. A more e