M.T.
I am a first time mother of a 7 month old son who just cut his first tooth. While he did not bleed with it, I have read that sometimes they can develope what looks like a "blood blister" over the site where the tooth will eventually make it debut. Now while there is a covering of skin over the blood (much like when you get a blood blister on your hand or finger) when that sharp little tooth breaks through the surface, it will obviously puncture that "bliser". Hence the blood on your son's face and hands. And since babies are constantly rubbing their faces when they sleep (I know mine does!!), it probably looked like more blood than there really was. BUT, if it concerns you, and I'm sure it does because it would concern me seeing any blood on my son's face that doesn't belong there, contact your son's pediatrician. Or you could try contacting a dentist who specializes in pediactric dentistry. Hope that helps and eases your mind.