A primary or metastatic malignant neoplasm involving the lip. The disease is Monarch Disease Ontology id MONDO_0006834 (lip cancer). Also known as: cancer of lip, malignant Lip neoplasm, malignant Lip tumor, malignant Lip tumour, malignant lip neoplasm, malignant neoplasm of Lip, malignant neoplasm of commissure of lip, malignant neoplasm of external Lip, not specified as upper or lower.