Epithelioma is to be differentiated from syphilis, wart, and lupus. Occurring about the genitals, it may be confounded with chancre, but the history, duration, character of the base and edges will serve to differentiate the diseases. The syphilitic lesion, wherever occurring, runs a much more rapid course than epithelioma. In tubercular syphilis several points of ulceration are usually seen; in epithelioma usually only one. The secretion from syphilitic ulcerations is generally abundant and of a yellowish, creamy character; in cancer it is scanty, viscid, stringy, and streaked with blood. The ulcer of syphilis rarely has the elevated, infiltrated border usually seen in epithelioma. Warts or warty growths must be distinguished by attention to their history and course; observation extending over months may at times be necessary before a positive opinion as to the existence of epithelial degeneration is warrantable. In lupus vulgaris the deposits are peculiar and are multiple, while in epithelioma the lesion is usually a single formation. The former generally begins in early life; the latter is a disease of the middle-aged and old. It remains to be stated that occasionally cancer and lupus occur combined, the former usually following the latter.
TREATMENT.—The variety, extent, and rapidity of the process are always to be duly considered in the prognosis. The superficial form may exist for many years without causing alarm. The deep-seated variety is always to be viewed as a serious disease, and is often fatal. Relapses after operation, even where this has been well performed, are frequent. The treatment is in most cases—for the time, at all events—successful. If the diseased tissue is thoroughly removed, the relief may be permanent or may at the least extend over several years. If, however, cauterization or operation is not thorough, the parts are scarcely healed before symptoms of a recurrence manifest themselves. Internal treatment does not seem to exert any beneficial effect upon the disease. In regard to local treatment, whatever operation or remedy is capable of removing or destroying the growth may be employed, caustics, the curette, and the knife all being available for this purpose.
Among the caustic agents, potassa in stick or in solution is one of the most valuable. Chloride of zinc in paste or stick form may also be mentioned as being of service, but it is a painful caustic. Arsenical pastes are efficient, and have the advantage of sparing the healthy tissues; one consisting of equal parts of powdered acacia and arsenic, to which a small proportion of morphia may be added, will be found serviceable; it should kept applied in the form of a plaster for from six to twenty-four hours, or until the pain, which is apt to be severe, becomes unbearable, and then poultices applied. Pyrogallic acid, from one to four drachms to the ounce of resin cerate, is a very valuable remedy. Its action is slow; it should be renewed twice daily, and its application continued for a week or longer. As a rule, it is painless.
One of the best plans of treatment is that with the dermal curette. The diseased tissue is thoroughly scraped away, the wound dressed with some simple ointment, and healing allowed to take place. Sometimes after the use of the curette it is advisable to cauterize lightly with caustic potash or to apply an ointment of pyrogallic acid for a few days to ensure complete destruction of the disease. There are other cases in which excision constitutes the most useful method of treatment. In cases in which there is much loss of tissue a plastic operation may be performed, being preceded by a thorough removal of the diseased tissues. The galvano-cautery is another method which may be resorted to.
Sarcoma.
Sarcoma cutis, or sarcoma of the skin, is a rare affection, consisting of shot-, pea-, hazelnut-, or larger-sized, variously-shaped, discrete, non-pigmented or pigmented tubercles or tumors. They are smooth, firm, and elastic, are not markedly painful upon pressure, and show a tendency to reach the surface and ulcerate. The overlying skin is at first normal and somewhat movable, but as the lesions approach the surface it becomes reddened and adherent, or if of the pigmented variety the skin acquires a bluish-black color. The multiple pigmented sarcoma (melano-sarcoma) appears, as a rule, first on the soles and dorsal surfaces of the feet, and later on the hands, the lesions manifesting a disposition to bleed.
The disease described by Geber and one of us (Duhring) under the name of inflammatory fungoid neoplasm is doubtless a form of, or closely allied to, sarcoma. It manifests itself by the formation of several distinct kinds of lesions, the more important consisting of flat or slightly-raised coin- to palm-sized, rounded or ovalish, superficial or deep-seated, smooth, scaly, or crusted patches of a pale-pinkish or deep-reddish color; and prominent, rounded, or ovalish, soft, firm, or solid, furrowed or lobulated, tubercular or fungoid tumors, varying in size from a pea to an egg, somewhat depressed in the centre, and pale-red, deep raspberry-red, or violaceous in color. The flat patches with involution assume a mottled or streaked purplish, yellowish, or salmon color. The tumors may appear suddenly within a few hours or a day, or gradually in the course of weeks or months. After reaching a certain size they tend to soften, diminish in size, and undergo spontaneous involution or ulcerate. Itching and burning are usually complained of, but are variable. All regions may be attacked. It is rare. The so-called lymphadenoma, lymphadénie cutanée, and mycosis fungoide of the French may also, doubtless, be properly classified as a variety of sarcoma.
The disease is to be distinguished from the papular, tubercular, and gummative syphilodermata, lupus, leprosy, and carcinoma. As a rule, sooner or later, a fatal termination takes place. Treatment is palliative. Surgical interference may be of service in particular situations. Hypodermic injections of Fowler's solution in increasing doses have, it is stated, influenced the disease favorably.