Thanks, all for the suggestions. Unfortunately, it's not an entire log that is purled, but only about 6" of ONE ROW - there is a distinct line going through the middle of the log where it is. So, adding another log, or re-doing the last one won't help. I actually did think about embroidering the baby's name over that spot!
I'm curious about the suggestion to duplicate stitch over the top of it - how is that done?