Definition of "ulcerate" [ul•cer•ate]

• To develop an ulcer; become ulcerous. (verb-intransitive)
• To cause ulceration of. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "If untreated, the lesion may blister, ulcerate and eventually result in dead tissue."
• "The things to look out for are: if the mole rapidly enlarges, changes in colour ie it becomes darker or lighter or goes red, if it is irregular in outline, if it starts to itch – and certainly if it starts to bleed or ulcerate."
• "They all have ridges when they come in, and unless they're addressed, they become very sharp and they actually chew and ulcerate the insides of their mouth."