I had Lichen Planus for 10+ years. I started taking the probiotic strain Lactobacillus casei for arthritis I believed was caused by oral bacteria. Within 30 days my arthritis had improved but the lichen had almost disappeared!! After more research I found there is a link between the two so I added a women's probiotic and vitamin C. 60 days out and only a few white dots left and no itching!! Purchased both on Amazon.