Medline plus says
Originally Posted by
medline
When one pupil (of the eye) is a different size from the other one, there may be a serious underlying cause.
however
Occasionally, differing pupil size is inherited and there is no underlying disorder. If other family members also have this condition, then pupil size is probably genetic and is nothing to worry about.
At times, for unknown reasons, pupils may differ in size. If there are no other symptoms and if the pupils return to normal, then the temporary condition is nothing to worry about.
I looked at a few links, and most have the above (and see more at the link) quoted verbatum.
Being that you have accompanying numbness, you should see your doctor.