Hi. I'm new to this forum and just saw your post. I have multiple blue clustered venous malformations growing off my tounge, mostly under it. I don't know if this is the same thing as what your husband has.
I just had "ndyag" laser treatment a few months ago and it worked very well. They didn't try to get everything, but it looks and feels much better now.
The doctor explained that the laser color has to match the color of the lesion, which is why there are very few places that can treat a "true" venous malformation (blue) with a laser. It also doesn't work well on the outside of the body because it will leave a nasty scar.
I don't know if they have this laser where you are. I am in the U.S.
I hope this is helpful. Please send me a private message if you would like more details.
Hang in there!