What cream treats lichen planus? is there anything over the counter that i could buy?

I would check with your physician as lichen planus is autoimmune disorder it is important you get confirmed, The topical and sometimes systemic immunosuppressive therapy is required. It is better hence to have physician look at it

Olease don't make the mistake of thinking you can treat Lichen planus on your own, you need an oral pathologist to examineand prescribe the correct treatment, otherwise delays can cause undesirable tissue changes. Here is an article with which you should become familiar: https://www.mayoclinic.org/diseases-conditions/lichen-planus/diagnosis-treatment/drc-20351383