membrane separation in the eye

Hi,
there is a membrane on the white of my eye(right eye, right-side of the white) which form a bubble when i shift my eyeball to the right. but after a night rest, it disappear. It occurs before a few years ago. what is it?

[circumspect]

Most likely problem either a benign cyst of the conjunctiva or swelling of the conjuntiva due to irritation or allery (chemosis). Unless the swelling persists or irritates the eye usually no treatment is necessary.

JCH MD