Bunny with thicky crusty eyes and nose

Question
We have two, year-and-a-half-old female unspayed house bunnies.  They seem very healthy except that one of the bunnies has this thick crusty white ring around both her eyes and on and around her nose, no where else.  She had it once before and then it disappeared, it has recently returned worse than before and we can't figure out what we've changed, if anything, that made it go away and/or come back. We thought maybe mange but wouldn't the other bunny show signs too? She has never shown any signs at all.  Any help would be appreciated!

Answer
Dear Joanne,

What you are describing sounds like mange, which you can read about here:

www.bio.miami.edu/hare/furloss.html

and see pictures for comparison.  The safest treatment is Revolution (selamectin) from a good rabbit vet:

www.rabbit.org/vets

I hope this helps.

Dana