Abnormal veins in the location swell up, causing heat and growing.
There furthermore tiny glands in the eyelids which produce the liquid that makes up the other part of one's tears. In effect, they are the 'fake holes. http://Assholesanta.com/__media__/js/netsoltrademark.php?d=www.opticaljournal.com%2Fdry-eye-relief-for-cornea-abrasion%2F