That's probably the caruncle and is normal.
Dr. O.
Sorry that didnt work, here is the address of the diagram.
http://i301.photobucket.com/albums/nn56/adzyb/eye.jpg
Sorry, i've drawn a picture to help... the discoloration isnt as dark as in the diagram but it is to show the size and location.
[IMG]http://i301.photobucket.com/albums/nn56/adzyb/eye.jpg[/IMG]
A centimeter is 10 mm and is the size of the cornea. I am not sure what you are trying to describe.
Dr. O.