Like acne of the skin in general, this consists in inflammation and
suppuration of a hair follicle and sebaceous gland. The whole lid or a
large part of it may be swollen, but by stroking it with the finger, a
hard, rounded, very tender spot will be detected and as the disease
advances this develops a minute collection of pus. A specially wide
orifice favors the entrance of the pus microbes, and the onset of the
disease. It has been noted in dogs (Fröhner).
For abortive _treatment_ Fick recommends dry heat from a pocket
handkerchief or a heated teaspoon. If pus is present it must be
evacuated, and recurrence guarded against by cleanliness and
antiseptics. Use pyoktannin solution (1 ∶ 1000), or mercuric chloride (1
∶ 5000) or yellow oxide of mercury ointment.