Hi Kim,
Glad that you found this forum which is extended family for most of us. Regarding your question, only biopsy can confirm if the lump is cancerous or not. I would suggest you to visit a CCC or a good ENT in your city who get that biospy done quickly (Oct 17th is too far). Any patch on cheek or lump lasting more than 2 weeks must be examined. IF it is cancer, then timely treatment will help and improve the prognosis.
Take good care of yourself.