As regards treatment, it is usually necessary in all cases to incise the lesions and squeeze out or scrape out their contents; in some, touching the base of the excavation with a minute drop of iodine tincture or nitrate of silver may be required to prevent a reappearance. Electrolysis has also been recommended.
Steatoma.
Steatoma—or, as commonly called, sebaceous cyst, sebaceous tumor, or wen—appears as a variously-sized, elevated, roundish, or semi-globular firm or soft tumor having its seat in the corium or subcutaneous tissue. One or several may be present. They are cysts of the sebaceous glands, and may exist wherever these structures occur, but are seen most frequently about the scalp, face, back, and scrotum. They develop slowly, are variable as to size, and may exist indefinitely without causing any inconvenience except disfigurement. The overlying skin is either normal in color or whitish from stretching; on the scalp it is usually devoid of hair. Cysts are usually firm, but may be doughy or soft. As a rule, they are freely movable and painless. In some a gland-duct orifice can be seen; in the majority it is absent. Spontaneous suppuration and ulceration may occasionally take place in enormously distended tumors. Anatomically, steatoma is a cyst of the sebaceous gland and duct, produced by retention of secretion. It is in fact an enormously distended duct and gland whose walls have become thickened into a tough sac. The contents vary, in some being hard and friable, in others soft and cheesy or even fluid, with or without a fetid odor, and of a grayish, whitish or yellowish color. The mass consists of fat-drops, epidermic cells, cholesterin, and sometimes hairs. As a rule, the diagnosis is made without difficulty. Gummata, which may have some resemblance, grow more rapidly, are usually painful to the touch, are not freely movable, and tend to break down and ulcerate. Sebaceous cysts can scarcely be mistaken for fatty tumors and osteomata.
In the treatment excision is radical and most satisfactory. A linear incision is made, and the mass and enveloping sac dissected out. A removal of the sac is necessary, or a reproduction usually takes place. As the scalp wound especially should be treated on antiseptic principles, injecting the tumor with a small quantity of tincture of iodine or other irritant has been successfully employed.
CLASS II.—INFLAMMATIONS.
Erythema Simplex.
Erythema simplex is a hyperæmic disorder characterized by redness, occurring in the form of variously sized and shaped, diffused or circumscribed, non-elevated patches. The affection is due to various causes, which may be external or internal. Hence it is usual to divide the affection into two classes—idiopathic and symptomatic. Under the head of idiopathic erythema are described the erythemas due to cold, heat, traumatism, poison, etc. Erythema caloricum arises from the action of heat or cold. If the degree of heat or cold is sufficient, a dermatitis, or even gangrene, may result. In a mild degree, however, simple congestion of the skin—erythema—is produced. It is usually bright red in color, later becoming somewhat darker, and at times is followed by slight desquamation. If produced by the action of the sun—erythema solare—the uncovered parts only are affected. Erythema traumaticum is usually seen as a result of the pressure of tightly-fitting clothes, corsets, bandages, etc. It disappears rapidly upon removal of the cause, without scaling. If the cause is long continued, a dermatitis may be produced. Erythema venenatum is a term applied to the form of hyperæmia resulting from the action of substances poisonous to the skin: such are all irritating chemicals, the ordinary rubefacients, various dyestuffs, acids, alkalies, and the like. The symptomatic erythemas are the more important. The rashes often preceding or accompanying certain of the systemic diseases, such as smallpox, diphtheria, and vaccinia, belong to this class. Disorders of the digestive tract, especially in children, are responsible for many cases. Roseola is a term sometimes applied to the symptomatic rashes. The division-line between simple erythema and dermatitis is often ill-defined.
The indications for treatment in the various erythemata are usually self-evident. A removal of the cause in idiopathic rashes is all that is needed. The same may be stated of the symptomatic erythemata; but here there is at times difficulty in recognizing the etiological factor. Local treatment is rarely necessary. Dusting-powders, mild lotions, or ointments such as used in acute eczema may be prescribed.
ERYTHEMA INTERTRIGO.—Erythema intertrigo—known popularly as chafing—is a hyperæmic disorder occurring on parts where the natural folds of the skin come in contact, characterized by redness and at times an abraded surface and maceration of the epidermis. The causes are usually local. Thus it appears chiefly about the folds of the neck in fat subjects, the nates, groin, perineum, and axillæ. It is seen usually in hot weather in infants and others whose skin is tender. The skin becomes red from chafing, and if long continued or untreated the perspiration of the parts causes more or less maceration of the epiderm and a mucoid discharge. If the condition continues, actual inflammation may be developed. The affection may pass away in a few days or last several weeks. There is a feeling of heat and soreness about the affected parts. Occurring between the nates in infants, a favorite locality, from the friction of the parts, and the action of the feces and urine, it is often persistent. As a rule, it yields readily to treatment. The predisposition to its development, and its continuance are often due in children to derangement of the stomach or intestinal canal.