The plaster-mull is used in all types, especially the acute; the gelatin dressing, and the gutta-percha plaster, in the subacute and chronic; and the rubber plaster in chronic, sluggish patches only. Acacia, tragacanth, bassorin and plasment applications are used in cases of a subacute and chronic character. #Prurigo.# #Define prurigo.# Prurigo is a chronic, inflammatory disease, characterized by discrete, pin-head- to small pea-sized, solid, firmly-seated, slightly raised, pale-red papules, accompanied by itching and more or less general thickening of the affected skin. #Describe the symptoms and course of prurigo.# The disease first appears upon the tibial regions, and its earliest manifestation may be urticarial, but there soon develop the characteristic small, millet-seed-sized, or larger, firm elevations, which may be of the natural color of the skin or of a pinkish tinge. The lesions, whilst discrete, are in great numbers, and closely crowded. The overlying skin is dry, rough and harsh; itching is intense, and, as a result of the scratching, excoriations and blood crusts are commonly present. In consequence of the irritation, the inguinal glands are enlarged. Sooner or later the integument becomes considerably thickened, hard and rough. Eczematous symptoms may be superadded. In severe cases the entire extensor surfaces of the legs and arms, and in some instances the trunk also, are invaded. It is worse in the winter season. #What is known in regard to etiology and pathology?# It is a disease of the ill-fed and neglected, usually developing in early childhood, and persisting throughout life. It is extremely rare, even in its milder types, in this country. Clinically and pathologically it bears some resemblance to papular eczema. #Give the prognosis and treatment of prurigo.# The disease, in its severer types is, as a rule, incurable, but much can be done to alleviate the condition. Good, nourishing food, pure air and exercise are of importance. Tonics and cod-liver oil are usually beneficial. The local management is similar to that employed in chronic eczema. An ointment of [beta]-naphthol, one-half to five per cent. strength, is highly extolled. #Acne.# #Give a definition of acne.# Acne is an inflammatory, usually chronic, disease of the sebaceous glands, characterized by papules, tubercles, or pustules, or a mixture of these lesions, and seated usually about the face. #At what age does acne usually occur?# Between the ages of fifteen and thirty, at which time the glandular structures are naturally more or less active. #Describe the symptoms of acne.#