Had been diagnosed with severe duodenal ulcers, which over 6 months medicines was brought under control. Also Vitamin D was low, hence got the shots. Now, 6 months later after all this, i still keep getting mouth ulcers,which stay for a long time and leave a mark which stays for 2 weeks before disappearing. Altered diet and lifestyle of outside food etc.. when i was diagnosed with duodenal ulcers. Reduced outside food etc but why is the problem persisting.