Not sure if this is where I should ask but I don't know if I have an AVM in my mouth or not. My husband thought it looked like a blood blister, but I've been soaking my mouth with Epsom salts and water and it goes down and comes right back. I don't know what it is. I also have a small sore under my tongue which I'm trying to clear up and I do have an appointment on Monday to visit a Dentist. My dentures are bad and not fitting properly and I tried having them realigned and it doesn't last, so I tried to do it myself, and there is a lot of bone loss. All I know looking at it, it is purple color or blue color like a vein. My gastro doctor found AVM's in my colon and stomach and told me if I had them there I could have them in any part of my body. Don't know what it is but of course I am worried. Blood blisters once break don't fill up again, so I don't think it's that. The other sore under my tongue I know is from the lower denture, and I did file it down a bit but nothing is getting better. This past hear has been awful for me, and it seems one thing after another all the time.