ulceration

noun

1. a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue

   noun.state

   Synonyms ulcer

   Source: WordNet 3.0

2. the process of ulcer formation; the process of becoming ulcerated

   noun.process

   Source: WordNet 3.0

3. The process of forming an ulcer, or of becoming ulcerous; the state of being ulcerated; also, an ulcer.

   noun

   Source: webster1913