What can a family doctor do for swollen gums with little white blisters on them my dentist won't do anything ?

Maybe: I wish i can see them personally. But i hope your dentist referred you to an oral pathologist or oral surgeon to have them identified and diagnosed.

See oral surgeon: There can be several possible diagnoses. See another dentist or see an oral surgeon.

Referral : Maybe your medical doctor can refer you to a dentist who is more knowledgeable about your condition.