[Other malignant skin tumors: carcinoma of cutaneous appendages and metastatic carcinoma to the skin].

Carcinoma of cutaneous appendages, which are derived from hair follicles, sebaceous glands and sweat glands, are generally rare. Although no papers on malignant tumors derived from hair follicles have been reported either at home or abroad, several cases of distinct hair follicle carcinoma have recently been reported in this country. In this paper, malignant change of epidermoid cyst (follicular), malignant proliferating trichilemmal tumor, malignant change of trichilemmoma, and BCC-like tumor associated with immature hair follicle formation, were discussed as several types of malignant changes occurring in the hair follicle. Both sebaceous and sweat gland carcinomas, frequently show a relatively poor prognosis due to a marked tendency for widespread metastasis. In apocrine gland carcinoma appearing in axillar and chest areas, there is a difficulty in making differential diagnosis from carcinoma of latent accessory mammary gland. An outline of metastatic carcinoma to the skin was given.