The Fly Flies

A small creature creates an irritation,

 brings in a bothersome distraction,

inflicts a rare delusion,

leaves a nagging sensation.

It goes round the eyes,

perches itself over the nose,

sits on the cheeks like a dice,

hovers over the mouth in quick tries.

Driving it away poses a strain

getting rid of it is a gain,

Now is the time to tell you the main,

it is the common fly in its deign