Pain in my cheek

I have a very painfull cheek which when i touch feels like a hard lump and swells up quite a lot. On the inside there is a really big ulcer which will not go away. What is this and how can i make the pain go away?

[Jerome Tsang, DDS]

You should probably go to the dentist and get it checked out.  It might be something simple like you bite your cheek and its swollen and irritated but it could also be an abscess or something more serious.  Its always a good idea to check it out to make sure and address it properly.