Yes! I have had great success with dietary changes.
I currently eat no dairy, no flour of any kind, no sugar or artificial sweeteners. I also abstain from caffeine and all grain except for 4 oz of rice a day.
I weigh and measure all of my food. The only time I have had a flare in the last few years of eating like this has been when the 8 oz of fruit I eat per day is overly sweet. ( For example, if I eat watermelon for my fruit several days in a row, I will begin to get itchy.)
I am currently considering giving up the rice since I think it could be contributing to a mild flare.
But on the whole, my experience of eating like this for 7 years, I seldom have flares and use the clobetasol for maintenance.
When I was eating flour and sugar, my lichen schlerosis was out of control.