As already mentioned by a few, you sought a "simple answer to a simple question", but the fact that you still believe it so "simple" reveals your need to be here and learn along with the rest of us.
"Will an ulcer heal?" depends on many things, including the cause of the ulcer and the environment it has to heal in. The same goes for cuts, torn fins, lost scales, etc...
We've all learned that an answer worth having to any question requires more information than can usually be gleaned by the asking of the "simple question". Details matter, and if you stick with this hobby long enough you too will find yourself answering questions with more questions...