I had trouble with my piggy biting at first. She has always nibbled and licked my fingers, but she would occasionally turn quick and nail my fingers. Blood was drawn a few times. What you do is, when they put their teeth on you, blow a quick blast of air in their face (not to hard) but that stopped it right away with my pig.
I had that a quite a few times too. My harriette never peed on me untill last night. I held her and she nibbled on my finger. I thought that she was smelling food on my fingers cause I just ate. Not she peed on me after she was done. I yelled Harriette and she looked up at me like Oops sorry mummie. I had to shower and change.
Why is it then whenever you come across a site about the nature of guinea pigs it always states that that rarely if ever bite. I am not talking about nibbling or a peck. If a piggy constantly bites and especially draws blood, I would think something is wrong there.