Definition, congestion, heat, redness, tenderness without eruption.
Sheep: swine: dogs: white horses and cattle. Causes: slight irritants.
Symptoms: congestion momentarily effaced by pressure, may go on to a
distinct irruption.
_Definition._ Congestion of the papillary and adjacent layers of the
skin with heat, redness, and tenderness, or a diffuse superficial
inflammation with some superadded swelling.
_Genera susceptible._ The affection is seen in sheep, swine, dogs, and
in white horses and cattle or on white parts of the skin. It is not
readily recognized on pigmented parts.
_Causes._ The action of any slight irritant: pressure, friction,
brushing, currying, blows, vesicants, rubefacients, stings, parasitism,
radiant heat, intense sunshine, cold (reaction), storm, plunging in cold
streams when heated, feeding on stimulating agents, notably buckwheat.
_Symptoms._ On white skins there is a uniformly diffused redness,
without papule or other eruption, and the color may be momentarily
effaced leaving a perfectly white spot, made by the pressure of the
finger. The affected part is warm, tender, and it may be, itchy. It may
be but the first step of a distinct eruption of another kind, such as
variola, vesicles, papules, pustules, but then the affection takes a
different name. It has been named according to its seat, cause and
nature as follows: