Not sufficient information shared so difficult to understand the issue.

Hello . You need to get it clinically examined as if we go with your description it can be any thing broadly. So to narrow down and reach to a proper diagnosis of the problem you need to get a professional dental examination done and if possible kindly upload a picture of it. Just in case you need to get a opinion we are available on video calls too. Stay safe and keep smiling

Hello Plz share pic.and need Xray to diagnosis

It can be abscess or ulcer. Based on detailed clinical history, medication can be prescribed. You can consult through this for prescription of medication and instructions on investigations

Goodafternoon ..kindly  share picture of the same ..if anxious please visit dentist for proper examination  and diagnosis ..certain bump are normal and non problematic  but without  clinical examination anything to say is not solution....

It's hard to diagnose conditions without an examination, but a small painless bump on top of your mouth could be a number of things, including a canker sore, a cyst, or an ulcer. I recommend visiting clinic for a proper diagnosis and treatment if necessary. In the meantime, try not to touch or irritate the bump to avoid further complications.