What can cause tongue ulcers to remain 3 months on a 12 month old She was dx with foot and mouth 3 months ago and still has tongue ulcers?

Persistent tongue ulcers in a 12-month-old who was diagnosed with hand, foot, and mouth disease (HFMD) three months ago could be due to several factors. These include secondary infections, underlying immune system issues, or a reaction to food or irritants that exacerbate the condition. Additionally, if the ulcers have not healed properly, they may require medical evaluation to rule out other causes such as viral infections, nutritional deficiencies, or oral thrush. It's important to consult a pediatrician for an accurate diagnosis and appropriate treatment.