Description of your problem is pointing towards hairy leukoplakia which is a condition not to be ignored,but without seeing the affected area we can not decide the exact diagnosis.
It's better you go for a video consultation or visit your nearby dentist so that one can look into it and diagnose the exact condition and prescribe you medication.
Next Steps
1.Book an appointment with a dentist.
Health Tips
1.Maintain a good oral hygiene.
2.Night brushing.