Hi AnnieMoe, welcome at the forum.
I recognize it, avoiding the dentist. Also, friends don’t understand how difficult it is/was, because when I had a bad lessions, I would avoid/cancel appointments (or even avoided making appointments at all).
Just to be sure, can you confirm whether the lessions look like the photos here: What does it look like? (photos) ?
The lession your husband got, is it also the same skin issue?
Note that Soolantra should (probably) be applied on a large area, not just on active lessions. It may also give a worsening in the beginning. (For some people, it may be better to start slowly with it.)
What other stuff did he got from his derm?