<unk> is the perceptual disturbance experienced by some migraine sufferers before a migraine headache, and the telltale sensation experienced by some people with epilepsy before a seizure. It often manifests as the perception of a strange light or an unpleasant smell.
An<unk> does not necessitate the onset of either a migraine or a seizure and not everyone who suffers from migraines or seizures will experience<unk> . Though<unk>  tend to be an unpleasant and irritating sensation, they can be beneficial.  Most injuries from seizures occur when there is no warning.<unk>  allow epileptics time to prevent injury to themselves. The time between the appearance of the<unk> and the onset of a migraine or seizure can be anything from a few seconds up to an hour. Most people who have<unk>  have the same type of<unk> every time.
Aura 
Orbit 
Fleas
Lacrimal bone
Olea
Skull
Gyrus
Vertebra