[Multiple tumors of the follicular infundibulum with basocellular degeneration. Apropos of a case].

A progressive papular eruption on the face, limbs and vulva had been present for seven years in a 38-year old female patient. Some papules were small and confluent while others were sparse, as in nodular prurigo. Histology showed massive proliferation of the follicular sheath epithelium, connected to the lower surface of the epidermis. The lesion formed a plate-like area very similar to that observed in superficial basal cell carcinoma and corresponding to a tumour of the follicular infundibulum. Remarkable features of this case were the large number of lesions, their photosensitivity (they became pruriginous and increased in size after exposure to the sun), the presence of eccrine sweat glands beneath a skin lesion of the thigh, the basal cell degeneration of two lesions and the slight improvement observed after etretinate therapy. To our knowledge, such findings have not yet been reported in tumours of the follicular infundibulum.