I had my wisdom teeth extracted close to a month ago. Everything seems fine and then I developed an infection. The infection was cleared up with anti-biotics. Since then I have had sensitive gums supposedly from my teeth shifting after removal. A couple of days ago I noticed a dark red spot almost looks like a blood blister by the extraction site in my mouth. It is pretty difficult to see since it is far back in my mouth. It doesn't hurt but feels rough if I rub my tongue on it. Also if I gently rub my toothbrush of the gum its like little hairlike pieces come off. Not sure If I should be doing this or what it is? I really hope its nothing to serious.