Hello Linzy, Thanks for writing to us. The bump developed at the hard palate may be due to- Deep dental caries progressed into periapical abscess. Gingivitis lead into periodontal abscess. Removable dentures/orthodontic appliances inserted. I would advice you to get clinical evaluation done by your dentist to rule out the cause of bump arised. The pus has to be drained and curetted. Discontinue use of appliances/dentures if causing irritation. Root canal treatment has to be done if required. Hope this helps.