Hello, @navyblue – welcome to Mayo Clinic Connect. The scarring you are talking about would distress me, too.
I have moved your post here to this discussion on lichen planus (LS) so you can talk with others in this existing discussion on this condition about your questions such as the kind of soap to use and whether any particular kinds of soap or other factors can flare up the lichen planus. They may also have some thoughts to share on whether folic acid pills are helpful. Please meet @becsbuddy@jlclaussen@grammlyn@dreamer38 and others here.
Have you noticed anything so far that seems to make your LS flare up?