Yes I have been on steroids but I have them all the time even when I'm not taking them.
well they certainly start as a blister so will look into it, thanks
Have you been treated with steroids? I wonder if this could be one of the side effects?
This might not be what you want to hear, but I get sores on the roof of my mouth and they are Herpes sores, (HSV 1 same virus that causes cold sores). It's not that common to get them like that (roof of mouth) but in my case it is from being immune surpressed. If it starts off like a blister (like you burned the roof of your mouth) then turns into an ulcer this might be what it is.
Alex