ulcerate
From Longman Dictionary of Contemporary EnglishRelated topics: Illness & disabilityulcerateul‧cer‧ate /ˈʌlsəreɪt/ verb [intransitive, transitive] MIto form an ulcer, or become covered with ulcers —ulcerated adjective —ulceration /ˌʌlsəˈreɪʃən/ noun [uncountable]→ See Verb tableExamples from the Corpusulcerate• There is a tendency for mucous membranes to ulcerate and the ulcers to spread.