Gazmo. Yes it is treatable. It takes anywhere from 6weeks to 6months.
A lot more information is required to be able to recommend a remedy. Based on you general description atleast 12 remedies are applicable.
Post back a reply with you case history (or better yet email me for a faster response). Also, give us more info on the ulcers..example; which of the following apply?
-producing pus which dries to blackish crusts