It may be apparently harmless for a long time, but will eventually induce keratitis with inflammatory exudations.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
These "dots" appeared to be dried exudations from pores.
"Sex-linked Inheritance in Drosophila"
Thomas Hunt Morgan Calvin B. Bridges
One conceives a notion of exudations supplied by the bearer's body, in which case the young would feed on their mother, after the manner of parasitic vermin, and gradually drain her strength.
"The Life of the Spider"
J. Henri Fabre