ulcer disease https://github.com/monarch-initiative/mondo/pull/5961 MONDO:0043839 UMLS:C0041582 SCTID:429040005 ulcer A lesion on the surface of the skin or a mucous surface, produced by the sloughing of inflammatory necrotic tissue. MEDGEN:22541 NCIT:C3426 ulcers MESH:D014456 disease by developmental or physiological process