There could be so many things. What worming have you done lately? What is the temp? What does the stool look like? Have you had a fecal done lately to include coccidia? What kind of feed/hay/minerals is the goat getting? Is there anything prickly that a pricker or splinter could have gotten stuck?
Also, I did just have fecals done and my one girl has enough Barberpole that the vet said to treat her. Her eyelids were a nice dark salmon color. So sometimes even eyelid color won't give you the whole picture.