@5007, here are a few discussions you may find helpful:
- Mouth Sores from chemo: When do they go away? https://connect.mayoclinic.org/discussion/mouth-sores/
- Anyone else dealing with painful mouth sores and burning mouth?https://connect.mayoclinic.org/discussion/anyone-else-dealing-with-painful-mouth-sores-and-burning-mouth/

There are many discussions about methotrexate. To help me connect you with others like you, can you tell me what condition your were prescribed methotrexate for?