Here is an excerpt from the USAPL/IPF rules concerning tape.
7. Two layers of medical tape may be worn on the thumbs. Medical tape, or its like may not be worn
anywhere else on the body without official permission of the Jury, or Chief Referee. Medical tape
may not be used as aids to the lifter in holding the bar.
8. Contingent upon prior approval by the Jury, Official Doctor, Paramedic or Paramedical personnel
on duty may apply medical tape to bodily injuries in a fashion that would not grant the lifter an
undue advantage.
9. At all competitions where a jury may not be present and no medical personnel are on duty. The
Chief Referee shall have jurisdiction over the use of medical tape.
They may let you tape it at the meet if it is a question of bleeding on the bar but I doubt it as they will probably view it as an aid to the lift. Hopefully it will heal up before then. The advice given above about using a pumice stone and a good lotion (try Cornhuskers lotion, this is a manly lotion) is good preventative advice.
Best of luck at your meet!