[Keratoacanthoma. Epidemiologic study of 100 lesions]

An epidemiologic analysis of keratoacanthoma was presented about: age, sex, topography, histology type, clinic variety, size and time of evolution. One hundred tumours are studied for one hundred patients, the study took place at the Dermatology Institute of Guadalajara of the SSA using the clinic and histology archives and the inspection of the lesions by microscope. It concludes that the keratocanthoma is uncommon in children, it usually presents itself between the ages of forty and seventy years, it affects exactly the same number of males and females, it principally affects sun exposed areas, it usually affects middle face area on the head, it doesn't appear on palms, soles and mucoses, it affects the same superficial levels as low level of the hair follicle, the most common type is the solitary keratoacanthoma, being rare for observations the multiple as the eruptive keratoacanthoma, it generally has 2 cm. or less on size but could even be up to 5 cm. or more and it has an average period of evolution of five months.