Definition. Tumors are solid, semisolid or cystic, benign or malignant elevations of any size from a cherry upward, of variable shape, consistency and color.
They may originate from any part of the skin, its appendages, vessels or nerves. They may arise from new formations situated within and beneath the derma, movable or firmly attached to the parts beneath or to the skin, and, if to the latter, raising its surface or projecting from it in a variable degree. They may become pedunculated or even pendulous. They may or may not be attended with subjective symptoms. Tumors are of different constitution, character, growth and termination according to their anatomical location, the nature of the causative pathological process and accidental or extraneous conditions. As generally accepted thy are large and prominent formations but the dividing line between them and the large tubercles is very vague and purely arbitrary. In fact tubercles are often spoken of as small tumors. However, it is best to apply the term tumor (from a dermatological standpoint) to growths exceeding the size of a cherry. In reality tumors are often egg-sized or larger. In color they will vary from that of the skin to a thin glistening appearance when the skin is put upon the stretch; secondarily they may become pink or red in appearance. Inflammatory tumors such as carbuncles and gummata show a certain amount of lateral extension with suppurative and neurotic developments, but many tumors are non-inflammatory and stationary, such as fibroma.