That doesn’t sound to safe. It could just be you were laying on the arm but I don’t think it would be itchy if you did that, plus it probably would have stopped feeling numb by now if it was. It’s possible if something bit you, I have no idea but considering it started in your fingers I don’t think this is the case. The chance of something biting your fingers is small unless you deliberately put your hand in a creatures mouth. Again, this isn’t out of the question but it’s still a small chance. Reading this, I’m worried.