10 Things You Didn’t Know About Lichen Planus

3. Chemical Exposure

Other drugs and chemicals are believed to be related to an outbreak of lichen planus on the skin. Drugs with the ingredients arsenic or bismuth are known to result in similar-looking rashes. The legs can be affected by the hypertrophic form of the condition following extensive use of quinacrine or quinidine. Such drugs treat abnormal heart rhythms, like heart flutters. Some findings have discovered the use of photo development chemicals produce a rash like lichen planus.