SYNOPSIS Attention is drawn to a benign skin tumour which has escaped recognition in the British literature. Inverted follicular keratosis can be mistaken clinically for basal cell carcinoma and a variety of benign skin lesions. Pathologically it is easily confused with squamous carcinoma, a serious error because this lesion occurs dominantly on the face. The lesion is thought to arise from the infundibulum of the hair follicle.The purpose of this paper is to draw attention to a lesion which has been described in the dermatological and ophthalmic literature but which is little known to general pathologists. Helwig (1954) gave it the name 'inverted follicular keratosis' and described its essential characteristics. This descripion is, however, unavailable to most pathologists. Boniuk and Zimmerman (1963) reported on lesions of this type on the eyelids. We have not been able to find any reference to it in the British literature.
Materials and MethodsWe collected nine lesions, all treated by surgical excision. Eight were found by searching our records between 1954 and 1973 inclusive, and one was seen