Here's part of another article that I'd found  at  
http://www.aafp.org/afp/20000601/3319.html


While most cases of lichen planus are idiopathic, some are linked to medication 
use or hepatitis C virus (HCV) infection. 

 
Lichenoid drug eruptions are reactions that may occur after exposure to various 
medications. These eruptions may exhibit a cutaneous and histologic appearance 
identical to that of idiopathic lichen planus and, thus, must be considered in 
every patient with lichen planus. While an exhaustive list of possible 
offending agents is quite long, the most common include gold, antimalarial 
agents, penicillamine, thiazide diuretics, beta blockers,7 nonsteroidal 
anti-inflammatory drugs, quinidine and angiotensin-converting enzyme 
inhibitors.8 The interval between administration of the offending medication 
and the development of the lichenoid drug eruptions is usually a few months, 
although it may range from 10 days to several years.8 While the eruptions 
spontaneously clear anywhere from weeks to months after discontinuation of the 
medication in many patients, some patients require systemic therapy. 


      


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