Experts have not yet found out the exact reasons for this disease and its development. However, specialists have already come up with a list of causes, and the most likely culprit is an autoimmune trigger after a viral infection. Additionally, experts have pinpointed that stress plays a huge role in the development of this disease. Specialists have proven that lichen planus does not have any pathogens involved. Also, according to them, some of the following may trigger a lichenoid reaction which is connected to lichen planus.
1. Hepatitis, which includes primary biliary cirrhosis and hepatitis B and C infection
2. Adverse body reaction against metal alloy fillings
3. Lesions caused by graft versus host disease
3. Drug reactions