What causes mouth ulcers in a two-and-a-half-year-old child?

The causes of oral ulcers in a two-and-a-half-year-old child may be multifactorial. 1. It may be related to insufficient intake of vitamins, particularly deficiencies in B-complex vitamins and zinc. These nutrients are crucial for maintaining the health of oral mucosa, and their deficiency may damage the mucosal lining, leading to ulcers. 2. Genetic factors may also contribute to the development of oral ulcers. If there is a family history of oral ulcers, the child's risk of developing them may increase. 3. A weakened immune system may make the child more susceptible to pathogenic invasion, disrupting the immune balance in the mouth and triggering oral ulcers. Parents are advised to seek timely medical attention for their child to determine the underlying cause and initiate appropriate, targeted treatment.