Objective To study the best methods in treating lichen planus.Methods 300 cases of oral lichen planus were randomically distributed three groups:immunotherapy,block therapy and general therapy.Total efficacy rates and recurrence rates of every group were clinically observed.The OLP were treated with levamisole and polyresistin by taking orally in immunothearpy,with 2% lidocaine and equal dose of 5%prednisolone by blocking the base of pathological changes and nerve end in block therapy.In general therapy,abo...