vanishingly unlikely. your saliva is your first defense against viruses. as you may have heard before hiv is a pretty weak virus - it dies easily outside the body. you would have to rub it into an open wound. please don't tell me you also have an open wound in your mouth. also just for hygiene's sake what are you doing going around licking other people's blood off your finger? and how exactly are you getting someone's blood on your finger? and finally how in the world do you know they are hiv positive? sounds like you are engaged in some pretty interesting activities and you might want to rethink your life. of course you may have a perfectly plausible explanation as to why you are getting hiv positive blood on your finger and licking it.
i saw blood on my finger and licked it. if the person who had the blood is hiv+ can the virus be transmitted to me?