A system of practical medicine. By American authors. Vol. 4

by Unknown

Impetigo.

Impetigo is an acute inflammatory disease, characterized by the formation of one or more pea- or finger-nail-sized, rounded and elevated, usually firm, discrete pustules, seated upon an inflammatory base. The affection is at times preceded by slight malaise. The lesion is pustular from the beginning, and when well advanced may be of the size of a pea or finger-nail, is rounded, or semiglobular, markedly elevated, yellowish or whitish in color, with at first a more or less pronounced areola, which as the lesion matures becomes less and less marked, and finally almost entirely subsides. The pustule is usually distended, shows no disposition to rupture nor to umbilication, and is characterized by but little surrounding infiltration, and even where several exist close together they show no tendency to coalesce. Ten, twenty, or more lesions are usually present, and are most common about the face, hands, feet, and lower extremities. They dry to crusts of a yellowish or brownish color, which are usually thin and drop off, no pigmentation or scar remaining. The process is of brief duration, is benign in character, and is rarely attended with subjective symptoms. It is commonly seen in children under the age of ten.

The disease, apparently, is not related to eczema; occurs, as a rule, in well-nourished subjects, and is not contagious. The lesion is a typical pustule, the process being distinctly circumscribed. The walls are somewhat thick, and are probably made up of both the horny and mucous layers. There is no inflammatory base. Microscopically, the contents are found to be composed of pus-corpuscles, a few red blood-corpuscles, epithelial cells, and cellular débris. The disease is to be distinguished from pustular eczema, impetigo contagiosa, and erythema. The pustules of eczema are numerous, closely crowded together, small in size, tend to coalesce, with a decided disposition to rupture, and are accompanied by itching. The lesions of impetigo contagiosa are vesicular or vesico-pustular, flattened, superficial, thin-walled, often umbilicated; if close together they tend to coalesce, and dry to lamellar crusts of a yellowish color, and the affection is distinctly contagious. The pustules of ecthyma are flat, with an inflammatory base and areola; the crusts are brownish or blackish, and seated upon a deep excoriation; and the affection is, moreover, usually seen in adults and in those whose general health is markedly below the standard.

The affection rarely calls for treatment, as it tends to spontaneous recovery. Incision and evacuation of the matured lesions and a simple protective dressing of a mild ointment, such as oxide-of-zinc ointment, may be advised. If slight stimulation is desirable, ten or twenty grains of ammoniated mercury may be added to the ounce of the ointment.

Impetigo Contagiosa.

Impetigo contagiosa is an acute, inflammatory, contagious disease, characterized by the formation of discrete, superficial, flat, rounded or ovalish vesicles or blebs, which soon become vesico-pustular and pass into crusts. Precursory febrile symptoms, especially in young children, frequently usher in the eruption. The lesions begin as discrete vesicles, small in size, becoming vesico-pustular and increasing by extension peripherally, reaching the size of a pea or developing into blebs as large as a dime or silver quarter dollar. They are flat, slightly or markedly umbilicated, the umbilication being more marked in the older lesions. Several or a few dozen such vesicles or blebs may be present, and if situated close together may coalesce and form patches. There is very little areola, and the covering of the lesion is thin and withered-looking. The superficial character of the process is a striking feature. In a few days the lesions dry to crusts, thin, granular, wafer-like in character, light-yellowish or straw-colored, and but slightly adherent. If the vesicular or bleb wall or the crust is removed, a slightly excoriated surface is disclosed, resembling a superficial burn, secreting a thin fluid. The lesions are seen most commonly about the face and hands, although they frequently occur on other parts. In some cases one or two dozen lesions are scattered over the general surface. In these instances the resemblance of the whole process to an acute contagious systemic disease with cutaneous manifestations is striking. The lesions of the affection as ordinarily encountered appear simultaneously or in crops. As a rule, there is very little itching, and when it exists is usually present only in the beginning of the disease or at night. The affection is contagious and auto-inoculable, and at times apparently epidemic; is seen most frequently in the warm months, and is confined almost exclusively to children. When occurring in adults it is usually of an abortive type. In addition to the cutaneous covering, the mucous membranes of the mouth and conjunctiva are sometimes affected. As a rule, it runs an acute course, lasting ten days or two weeks. In exceptional instances the disease is anomalous, as regards not only its course, but the character and type of the individual lesions.

The causes of the disease are not understood. Some authorities consider it due to the presence of a parasite,—a view in which we are not prepared to coincide. A fungus—in fact, several varieties—may be found in microscopic examinations of the crusts, but the same may be found in crusts of other diseases, and their presence may be considered as accidental. There seem to be two varieties of the disease, in one of which the lesions are for the most part confined to the face and hands, and in the other the lesions are scattered over the general surface. The affection is encountered most frequently among the poor and ill-cared-for. A relationship to vaccination has at times been noted.

In the diagnosis eczema and simple impetigo are to be excluded. The history, course, and characters of the lesions of contagious impetigo are entirely different from those of these two diseases. The size, growth, isolated character, the non-inclination to rupture, and the comparative absence of itching will serve to distinguish it from eczema. The pustule of simple impetigo is prominently raised; that of contagious impetigo is flat and usually umbilicated; the contents of the former are distinctly pustular, and the crusts thicker, smaller, and usually yellowish-brown; of the latter the contents are rarely more than vesico-pustular, the crust thin, light-yellowish or straw-colored, and has the appearance of being stuck on. Those cases which resemble an exanthem may in the early stages be confounded with varicella, but later the lesions are much larger than seen in that disease. In exceptional instances the resemblance to the blebs of pemphigus is more or less pronounced.

As a rule, but little treatment is necessary, as the affection tends to spontaneous disappearance. In some cases, however, in which there is more or less itching, auto-inoculation at the excoriated points takes place, and in this manner the affection may persist. An ointment of ammoniated mercury, ten or fifteen grains to the ounce, rubbed in the lesions, will have a curative effect; likewise an ointment or lotion of carbolic acid, ten grains to the ounce.

Ecthyma.