<s>[INST] Last night i felt a bump on the roof of my mouth at the back. The bump is a bit sore when food or my tongue touch it. i looked in the mirror this morning and the bump is pea sized and there are two large dark areas on the roof around the bump. They almost look like bruises. I am 20 years old, never smoked before and rarely drink alcohol. Whay could this possibly be? [/INST] Hello there.... What do u mean by bump? Swelling? There are few age related swellings /lesions in the palate that arise with indefinite etiology... One need not have a history of smoking or alcohol consumption to have them. They might be associated with minor salivary glands of the palate also. Impacted upper third molars erupting palatially would also give such a clinical picture. Since yours is the right age for the eruption of wisdom teeth, that might also be the cause. Get yourself evaluated from an Oral and Maxillofacial Surgeon only. </s>