thanks for your query.
YOu could have keratotic cyst
or keratin deposition in tonsillar crepts.
Tonsil have lots of pits (cripts) on its surface, so its a site for debries get deposited on it.
You dont have to worry, its not hazardous, only thing you have to do is do gently tonsilar massage
from lower pole to upper pole and do antiseptic gargles repeatedly.
Many thanks, take care.