Hello and welcome to HCM,
Thanx for the query,
Since the age of 6 years permanent teeth
starts erupting in the oral cavity and continue upto the age of 13-14 years and wisdom teeth is the last to be erupted at the age of 17-21 years.
During this eruption sequence sometimes the child may have low grade fever
reduced diet intake and sleep problems.
The white bump which you are describing is the permanent teeth that is erupting from inside,the loose tooth will be exfoliated within sometime and their is no need to worry.
If the fever persists and not reducing better visit a general physician once.
Hope so this will help you,