A carcinoma arising in the lip or oral cavity. Most oral cavity carcinomas are squamous cell carcinomas of the tongue, buccal mucosa, or gums. Less frequent morphologic variants include mucoepidermoid carcinoma and adenocarcinoma. Lip carcinomas are usually basal cell or squamous cell carcinomas. The disease is MONDO_0023644 (lip and oral cavity carcinoma). Also known as: lip and oral cavity cancer, oral cancer, oral carcinoma.