Our expert says:
I don't that we know 100% what the cause of Lichen Planus is. We think that it is an auto immune disease (like an allergy where your body makes antibodies against itself)that causes inflammation in the skin. Neoral is an immune suppressant drug also used for cancer, and does not normally give diarrhoea, but you may have an infection in the gut due to the immune suppressant effect of the medication - please inform your doctor so that they can test your stool.
See also http://www.aad.org/public/publications/pamphlets/common_lichen.html
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