<prompt> Keratoacanthoma is -A type of basal cell carcinomaInfected sebaceous cystSelf healing nodular lesion with central ulcerationPre-malignant disease  <response>: Keratoacanthoma is self healing nodular lesion with central ulceration More common in men, usually found on the face of 5070 years old. Lesions can grow to 13 cm over 6 weeks and typically resolve spontaneously over the subsequent 6 months.Etiopathogenesis Classically a cup-shaped growth that exhibits symmetry about its middle. Central crater is filled with a plug of keratin. Unclear etiology may be caused by HPV infecting a hair follicle Associated with smoking and chemical carcinogen exposure.Treatment Removal of central keratin plug may speed resolution. Excision is recommended for persistent lesions Excision scar is often better than that which remains after resolution. 