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There is nothing to worried as its just because of infection .
If it is closer to the front teeth it could be your incisive papilla, which is a normal and is not much to be worried. If it is up higher it may be a blocked duct or a bony tori (normal bony growth that some people have and others don't).
You are likely to suffer from chronic tonsilitis
which is an inflammatory reaction in tonsil which causes soreness and painful swallowing .
I suggest you Azithomycin for 5days and Hot water for drinking will ease pain and will show better improvement in tonsilitis.
Rinse mouth / Gargle with Chlorhexidine
which will kill bacteria that causing infections .
I suggest you to consult an ENT Specialist
and get treated as early as possible .
I wish you to have a good recovery and have a healthy life .
Thanks & Take Care .