My ferret is l*****g my face relentlessly

Answer 1

 It may be Adrenal Disease... if her genitals are swollen, she's suffering hair loss, or something else doesn't seem quite right, I recommend a trip to the vet.

If everything is fine, then she may just feel very affectionate towards you, or like the way you taste! Ferrets are stubborn, and usually aren't very adventurous when it comes to tasting new things. Once they do, however, and determine that they like it, they can be pretty obsessive. My ferret NEVER was interested in yogurt until she got some on her nose accidentally, now she can't stay away from me whenever I'm having some!