Hi Dear,
Welcome to HCM.
Understanding your concern.
Thanks for your concern . The symptoms you mention in query are clearly indicating 
vitamin deficiency . Sometimes due to vitamin deficiency cuts and sore mouth occur  the condition is known as chelitis , which further leads to occurrence of 
fungal infection and make things complicated. Due to deficiency aphthous stomatitis can also occur .
These condition will occur again and again until you fulfill the requirement of vitamins in body .
I would suggest you to :-
- Take 
multivitamin supplements for at least 15 days , specially vitamin B complex .
- Apply lidocaine gel  on the sores to relieve pain.
- Do betadine rinses twice a day .
Do 
hydrogen peroxide rinses mix with equal amount of water 1-2 times a day , which is extremely good for cuts .
If condition persist after one week then consult oral pathologist for proper diagnosis and to rule out condition like oral herpes .
Doctor may prescribe 
hydrocortisone ointment or antibiotics .
Hope your concern has been resolved.
Best Wishes,
Dr. Harry Maheshwari