See a dermatologist. Lp is often seen in the mouth, usually without any symptoms. Most often it presents as a distinctive skin rash which is very itchy. There is often a reaction to a med or infection as cause. Best treatment by experienced dermatologist.
Lichen planus. It is an autoimmune disease that has no real cure. It can come and go. Can appear like a lacework pattern on the oral mucosa, can also involve the mucosal linings of other parts of the body and can also show skin manifestations.