itching is intense. The inflamed areas are small at first and scattered
over the regions of the rump, back and neck (Fig. 69). After a time the
small areas come together and form large patches, and further spreading of
the inflammation results from grooming, scratching and biting the skin.
Scattered, elevated eruptions on the skin from which the hair has dropped
out are first noticed. These parts may show yellowish scabs. Later the skin
is thickened, smooth, wrinkled, cracked, or covered with sores. Scrapings
made from the inflamed areas of the skin may show the psoroptic mites.

_Mange in hogs_ is comparatively rare. It is caused by one of the sarcoptic
mites. The thin portions of the skin are usually first invaded. There are
violent itching and rubbing, and small, red elevations occur on the skin in
the region of the ears, eyelids or inner surface of the thighs, depending
on the part first invaded. The skin becomes greatly thickened and covered
with crusts and scabs. Pus formation and ulceration may occur.

TREATMENT OF SCAB AND MANGE.--A careful inspection of recently purchased
animals that pass through stockyards, or are shipped from sections where
scab and mange are common skin diseases, is an important preventive
measure. Infected animals should be completely isolated from the herd, and
kept apart from other animals until after they have been treated. Hogs that
are slightly infected should be quarantined and treated. If badly affected,
they should be killed, and the carcass disposed of by burning or burying.

[Illustration: FIG. 69.--A severe case of mange.]

_The different remedies used_ in the treatment of the disease may be
applied by dipping, hand dressing or washing, pouring, smearing and
spotting. The first method is the most satisfactory. The last method may be
used when a small area of the skin is involved, and during the cold