<prompt> All of the following regarding Lichen planus are true except -Does not involve mucous membraneAssociated with Hepatitis CTopical steroids are the mainstay of therapySpontaneous remission occurs after 6months to 2 years  <response>: Mucous membranes are commonly involved especially of oral mucosa, and less commonly of genital tract.Hepatitis C and chronic active hepatitis have been implicated for the causation of Lichen planus.Topical steroids are the first line of treatment.Lesions of Lichen planus heal spontaneously in 6 months to 2 years, leaving behind hyperpigmentation. 