Head, neck, shoulder, back, under girths, breeching, crupper. Summer. Moulting. Heavy coat. Thin skin. Youth. Symptoms: erect hair, papular groups, hot, thick rigid skin, itching, abrasion, ulceration, encrusting, pustules, white spot and hair. Treatment: laxative, cooling diet, cleanliness, pure air, shade, rest, alkalies, locally vaseline, astringents, dusting powder, anodynes, tar water, creolin, etc.

This shows itself especially on the head, the sides of the neck, under the collar, or saddle, the circingle or crupper, the breeching or general surface. In these cases the profuse secretion of sweat, and the friction of the harness is a marked local factor in its production. It often shows a preference for the summer season, the period of shedding the coat, the heavy coated animal, the animal with white, thin or delicate skin. Youth also predisposes.

Symptoms. There is usually erection or roughness of the hair, and the formation at such points of minute papules like small peas collected in groups. The skin may feel hot, thickened, lacking in pliancy, not to be pinched up in folds, the panniculus is contracted and manipulation shows tenderness. Soon the papules flatten and desicate and more or less violent itching sets in. The patient rubs or scratches himself, causing deep red congestion of the surface or even abrasion, or ulceration. Apart from abrasion the skin becomes covered with crusts or even scales which agglutinate tufts of hairs and dry up and desquamate.

In other cases the eruption advances from the condition of papules to that of vesicles and even of pustules, though finally drying up with the same pruritus as in the papular form.

In either case the affected parts are more or less depilated, red if on unpigmented skin, grayish and scabby or scurfy if on the darker. At times, after recovery, the patch remains devoid of pigment and hairs growing from it are white.

Treatment. It is usually desirable to clear out the prima viæ by aloes or Glauber salts, to resort to a carefully regulated, non-heating diet, to clean the skin of all concretions from sweat or otherwise, to give pure air and shade and to protect the animal from active exertion, profuse sweating and friction by harness or otherwise. In the early stages benefit will often come from the use of alkalies, especially sodium bicarbonate. Locally an inunction with vaseline to soften crusts, and the subsequent removal of these with tepid water, may be followed by some soothing or astringent application, always bearing in mind that what is soothing to one skin is irritant to another. Dusting powders (starch, lycopodion, magnesium carbonate, oxide of zinc, calamine, bismuth) will often do good; soothing lotions or liniments (lead acetate with laudanum, lime water and olive oil; sodium bicarbonate in well boiled gruel of oatmeal or marsh mallow; zinc oxide or sulphate in water or glycerine or as ointment in vaseline, etc, etc). In chronic stages with much squama and pruritus tar water or ointment; a lotion of tar and alcohol; creolin lotion; chloral lotion; or other stimulant application may be used.