I saw that picture today too. Not that this is any of my business, but Carrie Underwood is infinitely more fascinating than the boring project I should be doing at work.
With that, I don't know why she posted that picture and comment yesterday since she doesn't look any worse for the injury and/or having 40-50 stitches. She didn't actually say they were on her face, just that she might look different. Unless she's really insecure, she should have figured out that she looks the same. Maybe she had the stitches in her mouth? Maybe she wanted publicity? No idea.
Back to boring project ..