Follicular mange, which is due to a parasite called the Demodex folliculorum, affects the nose around the muzzle, the skin of the chin, and the skin of the paws surrounding the claws, where it burrows in beside the roots of the whiskers and larger and grosser hairs, and into the sebaceous glands. This insect is extremely irritating, causing the animal to rub and scratch. Examination around the roots of the whiskers and on the skin of the paws will show dark-red pimples or pustules about the size of a pinhead. This form of mange is sometimes difficult to get rid of. It can be treated with the preparation of coal-tar and oil of cade given above, which must be well rubbed in with a stiff brush, and which can be alternated every four days by an application of mercurial ointment well rubbed into the same parts.

Fig. 24. - Hair-follicle and Sebaceous Glands Affected by Demodex Folliculorum.

Fig. 25. - Demodex Folliculorum.

(Enlarged 100 Diameters.)

1, The egg; 2, Larva hexapod; 3, Larva octopod.