THE REGRESSING KERATOACANTHOMA

The clinical and pathological features of 11 cases of regressing kerat oacanthoma are presented. These lesions were from sun-exposed skin of individuals between the ages of 58 and 92 years and were of short clin ical duration (2-12 months). Histologically, these lesions showed simi lar features and consisted of symmetrical shallow cup-shaped invaginat ions of thin atrophic epidermis with overhanging edges. The underlying papillary dermis demonstrated variable degrees of inflammatory infilt rate and scarring. It is important to recognize these features as repr esenting regressed keratoacanthoma as they may be confused with other unrelated skin conditions.