A keratoacanthoma is a characteristic solitary flesh-colored to red, crateriform nodule, usually 0.5 to 2.0 cm in diameter. The lesion erupts rapidly and is often quite tender. A central keratotic plug or depression conceals a deep keratinous cavity. This plug or depression gives the nodule its characteristic volcano-like shape. The nodule is firm in texture, tender to palpation and pressure. Keratoacanthoma nearly always appears on sun-damaged skin. Typical locations include the face, neck, dorsal hands and sun exposed extremities. It occurs on the legs more often in women.