A soft round swelling at back of mouth on right side cheek not painful a smaller one on the other side of cheek opposite the bigger one and a few others along my cheeks inside also the smaller ones have blood marks on them ?

Diagnosis: The only way to find out what you have and what, if anything, is the appropriate treatment is to see a local dentist for a one on one clinical exam along with some x-rays. We can't diagnose these types of situations over the internet.

Poss. cheek biting: The two swellings on the opposite sides of your cheeks are most likely the normal outlets for the large salivary glands in your cheeks. The smaller ones with "blood marks" on them are most likely from biting your cheeks in your sleep. The only way to know for sure is to have a dentist examine you.

May be: May be nothing. May be serious. May be something in between. Without a clinical examination and appropriate imaging/lab tests there's no way to tell. Any bleeding, pain, or as in your case swelling, requires evaluation. Please see either your General Dentist or your General Physician to start the diagnostic process.

See DDS first: See your dentist to see if this is dentally related, Otherwise, you may be referred to your primary care MD or ENT for evaluation.