Hi..
Welcome to HEALTHCARE MAGIC..
As per your complain Nystatin is anti
fungal medication and is advised if an individual is diagnosed with
fungal infection..
Stinging and soreness inside the mouth can be due to fungal infection known as
Oral Thrush while can be due to other causes like deficiencies of Iron and
Vitamin B12, dry mouth, acid reflux, traumatic injury caused by sharp edges of teeth, side effects of medicines etc..
I would suggest you to
consult a Dentist and get evaluated and a thorough clinical evaluation and investigations like Oral swab culture and blood tests can help in diagnosis and treatment can be done accordingly..
As of now she can gargle with numbing mouthwash containing Lignocaine..
Do cool water rinses and suck ice..
Take Vitamin B complex supplements..
Avoid spicy foods..
Drink plenty of water to prevent dryness..
Hope this helps..
Regards..