My cats have done this for one of three reasons: 1. Teething - when they're kittens they need to chew things and it might be you. Doesn't sound like what you're talking about. 2. read more
Affection - the term love bite is apt because cats do this gentle nipping when they're loving on each other but again, doesn't sound like your situation. 3 - Overstimulation - cats communicate in a lot of different ways and this is can be one way they communicate they've had enough petting. read more