Ferguson M M, Simpson N B, Hammersley N
Oral Surg Oral Med Oral Pathol. 1984 Sep;58(3):283-7. doi: 10.1016/0030-4220(84)90054-9.
The synthetic retinoid, etretinate, has been used to treat ten patients with erosive lichen planus of the oral mucosa. Beneficial effects were minimal, with only a slight decrease in the areas of ulceration being recorded after 8 weeks of therapy. Side effects were common and troublesome, however, outweighing the marginal improvement.