I have several red bumps with a blood-like hole, (about the size of a pin-head), on the skin surface of my arms, face and sometimes on my head. At first I thought they were related to bed bug bites because we recently have our house bombed to get with of them. I was informed however, that bed bugs possess an anesthetic of sorts and when sucking human blood, it can t be felt. The sores last for several weeks and other than the sunken hole at the top, the bump itself is hard.