Have you had success in treating extensive lichen nitidus with a systemic therapy?  

I have never attempted to treat lichen nitidus with systemic therapy, as most patients are largely asymptomatic, and we know it is typically a self-limited condition.

I agree that treatment is not commonly pursued given the subtle, relatively asymptomatic nature. I did have a patient with extensive facial involvement, who responded to NBUVB phototherapy (under the diagnosis of lichenoid disorder, NOS).