Thanks for writing your query.
Bumps on the tongue can be due to enlarged cells of the taste buds
present upon the tongue. They can be enlarged due to constant irritation(can be due to sucking cough lozenges).
other common cause of bumps on the tongue can be due to oral thrush
as a result of inhaled steroids.
If mouth is not properly rinsed after using inhalers, fungal infection
like oral thrush/candidiasis
can develop and can present as bumps on tongue.
You should get yourself clinically examined at an Oral clinic.
Take care of hygiene of your mouth.
I hope this is helpful to you.