Thanks for asking the query,
There are many reasons because of which you develop bump on tongue few are;
-Accidental trauma due to biting or scalding.
-canker sores, ulcers.
-enlarged papillae if becomes inflammed.
-Medical comditions including diabetes
-Oral cancers which is associated with tobacco chewing
So a detailed clinical evaluation by your Dentist
is needed to confirm the cause and plan appropriate treatment. I would encourage you to get a checkup done by Oral and Maxillofacial Surgeon.
Meantime you maintain a good oral hygiene
, clean your slowly tongue with a tongue scraper or soft bristle toothbrush, use antiseptic mouthwash gargles twice daily.
Hope this helps out.