Hi..
Can understand your concern..
As per your complain and the explanation of the symptoms it seems that you have a
canker sore and due to inflammation there is pain and white centre is due to pus formation..
I would suggest you to
consult a dentist and get evaluated and in case it is a canker sore you can do saline gargles.
Gargle with 1:1 solution of
milk of magnesia and benadryl can be relieving..
Gargle with diluted
hydrogen peroxide with water can be relieving and you can apply milk of magnesia after rinsing..
In case of discomfort during eating you can apply numbing gel like orabase gel over the sore to avoid
discomfort while eating..
Application of steroid ointments can also help..
In case of pain you can take anti-inflammatory painkiller like Ibuprofen..
Hope this information helps..
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Thanks and regards..
Dr.Honey Nandwani Arora..