mixed results

Well, we went to get our fingerprints done today.  They let us in early, and my prints scanned without incident.  But Tim's first set of four was rejected, presumably due to the spot of psoriasis on his little finger (the tech aborted the process at that point).  Tim has permission to come back any time he thinks his fingers are clear, no need for an appointment.  BUT, this being psoriasis, there is no way of guessing how long it will take to clear up.  He's had this spot for at least three weeks already, and sometimes they persist for months!  So the first thing on my to-do list while Esther is gone at daycare tomorrow morning is to call USCIS and see what procedure we can follow (doctor's letter? documentation of a certain number of attempts?) to get permission to submit just the rest of his fingerprints if this one doesn't heal up soon.  Sigh.