I cut my finger with an old razor blade. cleaned up immediately with iodine and penicillin. wound looks healthy but now my elbow hurts. ?

Septic joint?: The incident you describe can result in bacteria gaining access to other areas of your body through your cut finger, despite your diligence in cleaning the wound. Joint pain, decreased motion, redness and swelling of the skin can indicate spread of infection from the original site. You should be seen by a physician and may possibly require treatment with extended course of antibiotics.