Hi Dr, I Have Been Getting A Recurrent Clear Blister,

Hi Dr, I have been getting a recurrent clear blister, for about 1 month, on my right lower inner gum (where my wisdom tooth was removed when I was 15, I am now 61). This occurs 1-2x/wk, starts as a small pressure sensation then develops into a tiny blister which enlarges to a full clear blister within 6-12hrs then either reabsorbs or ruptures within 24hrs. No pain, no mouth/breath oder. I have good oral hygiene habits and had seen my DDS 2x/yr until Nov2014 (no gum/oral/dental issues) when I retired on-board our sailing vessel and headed to the Caribbean islands. I have just returned to Boot Key Harbor, FL but do not know anyone here. Suggestions? Thank you, Deb