There are many diseases that can cause ulcers at the corners of the mouth, and a deficiency of vitamin B2 can help them recover more quickly by supplementing with vitamin B2. However, if the ulceration at the corner of the mouth is not caused by a vitamin deficiency, such as an infection or trauma, vitamin supplementation in this case will only assist and will not help much, so it is important for patients to actively seek out the cause and receive standardised treatment.