title: Recently, my lower eyelid did this brief, twitchy thing.  It felt like very quick, tiny quiverings under the skin.  By the time I got a mirror to see if it was noticeable, it had stopped.  What causes this?
mesh_terms: D001764:Blepharospasm / Q000175:diagnosis*; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans