Keratoacanthoma or KA is a skin growth that is reasonably common and is swiftly growing. It typically appears as a dome-like lump on skin which is sun-exposed on light-skinned elderly as well as middle-aged individuals. It is frequently found at sites of prior trauma or injury. Many researchers believe that keratoacanthomas is the less severe type of âsquamous cell carcinomaâ. Most keratoacanthoma cause only nominal injury to the skin but some do act more antagonistically and can spread to lymphatic nodes.