Labetalol and lichen planus; are they related

I am being treated for hypertension using the drug Labetalol, among other medications. I have

also been treated by an MD for lichen planus. I have experienced Lichen planus eruptions in the

past, but they have always subsided after a few months, until the last occurence, which has covered

the time period of about two years. I have also been treated with Labetalol for HBP during that

period. Is there a possible link between the drug and lichen planus.