The 3 feral kittens I rescued from my back yard had that. I don't have money to be taking them to the vet for every little thing, so I figured if they weren't infected, I wouldn't worry too much about it. After being indoor cats for almost 2 months, 2 of the kittens have theirs all gone. The 3rd kitten has only been indoors for a week, but I figure she'll get rid of hers soon, too. If they were red, oozing or sensitive to touch (I can pet just fine, without kitty jaws snapping at me), then I would get them checked out.