Thanks for asking the query,
According to your clinical symptoms i suspect that there is erruption of permanent tooth and exfoliation of the milk tooth due to which you are having the above symptoms.
I would suggest you to visit the Dentist
and get the checkup done, take an x-ray of the tooth which will show the underlying permanent tooth buds or accordingly you can go for restoration or extraction of the tooth.
Go for complete mouth scaling and polishing
Maintain a good oral hygiene
Hope this helps out.