Neoplasmata

Neoplasmata are essentially characterized by the formation of new kinds of tissue in the skin. Neoplasms are observed in many different diseases of the skin, and under a variety of circumstances, but those diseases only are included in this chapter in which a neoplasm forms the entire disease. The new tissue in neoplasms has been regarded as originating in, and therefore an hypertrophy of, already existing elements; but it is certainly not a pure hypertrophy, and it is new in regard to its characters and behaviour. On this account it is impossible to include the neoplasmata in any but a special group.