#How is the destruction or removal of the epitheliomatous tissue effected?#
By the use of such caustics as caustic potash, chloride-of-zinc paste, pyrogallic acid, arsenic, and the galvano-cautery; and by operative measures, such as excision and erasion with the dermal curette, and by the _x_-ray. (See treatment of lupus vulgaris.)
In small lesions the use of an arsenical paste is a most admirable method of treatment, although somewhat painful. The paste is made of one part powdered acacia and one to two parts arsenious acid; at the time of application sufficient water is added to make a paste. This is applied thickly, and a piece of lint superimposed. A good deal of pain and inflammatory swelling ensue; at the end of twenty-four hours the part is poulticed till the slough comes away; the ulcer is then treated as a simple ulcer, under which healing takes place. Occasionally a second application is found necessary.
Upon the whole, the best method in the average case is to curette thoroughly, and supplement with momentary cauterization, with caustic potash, or with several days' use of the pyrogallic acid ointment. During the healing process, short exposures to the Röntgen ray--about every three to five days--is good practice.
The degenerative changes in the beginning of scurfy, seborrh[oe]ic spots or patches seen in old people can frequently be lessened or wholly stopped by the daily application of an ointment containing 5 to 10 per cent. of sulphur and 2 to 5 per cent. of salicylic acid.
#What can be said of the value of the x-ray in epithelioma?#
The _x_-ray method is now much in vogue, and proves curative in many superficial cases, and of benefit in some of the deeper-seated varieties. In most cases it must be pushed to the point of producing a mild _x_-ray erythema; and in some instances benefit or cure only occurs after more active exposure, sufficient to cause an _x_-ray burn of the second degree. The method is not attended with much risk if properly used. The healthy parts should be protected by lead-foil. Exposure should be two to five times weekly, at a distance of three to eight inches, and from five to twenty minutes, employing a tube of medium vacuum. Unfortunately the method is usually slow. The radium treatment is essentially similar to that by the _x_-ray.