my son has an H on te lower lip and he had it in his mouth also.
We followed the wait and see approach but it wasn't very helpful.
When the lip strted bleeding and went to see the plastic surgeon he tod us that e should check his inner organs (liver, intestine etc) for other Hs because hen there is an inner H like that in the inside of the mouth there might be as well others too.
I suggest you don't wait. You should chck the Hs with other experts too.
As far as the wait and see approach, the only thing that -my experience has taught me- causes is cosmetic problems.