<< See a vet. Could be ringworm.
You could get it too. >>

Could be or it could be allergies or something else altogether.  Once my late
cat, Cory, had that happen under his eyes.  It was very strange.  He had been
being treated for something else with depo-medrol injection and soon thereafter
developed patchy hair loss under his eyes.  The vet never knew what it was and
then it went away after a few weeks.  I felt it had to do with the depo-medrol.
Has your cat taken any medications lately?

Only a vet will be able to tell what it is.

Candace
(take the litter out before replying by e-mail)

See my cats:
http://photos.yahoo.com/maccandace

"One does not meet oneself until one catches the reflection from an eye other
than human."  (Loren Eisely)