Hello,I hope I can be of service.
A lump in the cheek is probably not of grave danger. If it is not a visible lesion or sore, it could be a gland that is irritated or has a blocked duct. Sometimes cheek biting in an area can create a lump also. If you can find your way to an oral surgeon, they have a lot of experience in soft tissue issues. You may need a referal from a general dentist however. You can make contact with surgeons in your area to see if you can go directly.