Here is the translation from the lady who said she has found some treatment.
"I'd like to remind the people who suffer about the treatment I've been using since a year and which is improving my skin condition day by day.
- Oestrogel all around the vulva every evening (I sometimes applied it at will when I was in too much pain)
-Trophicrème on the vulva, massaged til complete absorption.
- Andractim, applied once every three evenings, as advised on the user's note (this is a medicine which is recommended for LSA). Better not to overdo it as it can increase hair growth and trigger acnea.
- Once every two day, in the morning, I use some Dermoval, which i still couldn't bear not that long ago.
The complementary Dermoval treatment makes possible to bear the secondary effects. With time, the sking becomes tougher, and the Dermoval finally heals it, rather than burning it.
It might be long, but it works for many people in the US. Don't forget to write down everything you use, everytime you use it, and be as regular as possible.
My dermatologist told me that it takes about one month before the treatment starts to show effectiveness."
Last lines are about his homeopath doctor who told her that homeopathy can't heal this lichen.
Well, maybe it can't heal it, but it probably can bring in some help, for minimizing the unwanted effects from some of the stuff mentionned (some are pretty hardcore...)
A few notes, so you can find the equivalent in case they are sold under different names in US.
Dermoval is a dermocorticoide, which contains Clobetasol propionate
Andractim contains androstanolone (dihydrotestostérone)
Trophicrême contains estriol
By the way, i've just found this link with more testimonies (again in French, sorry...). I haven't read it whole yet, but there seems to be some information which you could use. I'll translate what is interesting and post it here.
EDIT : OK, after reading the new link, most posters talk about Dermoval, but one mentions BETNEVAL, which contains betamethasol, and says it is very efficient. Her daughter suffers from this lichen too, and she says that after 2 weeks of use, her condition has improved dramatically.
SOmeone also posted a link to some homeopathic cream, special for this lichen, and they ship to the US. here it is https://www.vietasante.com/Pommade_Vi..._PLANTAGO.html
Hope it helps