Hi ! Is there any history of trauma o that site. From your symptoms and signs, it seems to be an inflammatory swelling and the infection is spreading causing it to grow. Possibly it is an abscess
, which might be a hematoma
initially or a small boil initially which got infected due to any scratch or any other irritation.
As it is increasing and has started causing discomfort to your eyes, I would suggest you not to waste any time, and show it preferably to a surgeon at the earliest to avoid any complication arising out of it.
Wishing you an early recovery.