Periapical cyst    Periapical is the tissues surrounding the apex of the root of a #tooth  & a cyst is a pathological cavity lined by #epithelium  having fluid or gaseous content that is not created by the accumulation of pus. It is caused by #pulpalnecrosis  or dental caries or trauma  
 
Echinacea is another one of helpful Natural Remedies for Lichen Planus this is not just hostile to bacterial and against viral, it likewise a characteristic irritation battling expert and a satisfactory treatment option for skin situation.
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