Is that just one short section, perhaps a couple inches long? Everything else is OK? If so, then I'd just reglue that short section for complete safety, since a short section is usually a starter for a longer separated region. The proper way to do it is with latex adhesive (from Home Depot, carpetlayer's adhesive), but in a pinch you can do a short little stretch with rim cement just so you don't have a starting point for separation. At some point if you took this tire off yourself you'd probably see some of the same, though on a new tire it's a bit unfortunate, especially a Vittoria which tends to have pretty good adhesion.
Check the rest of the tire and inflate it overnight at max racing pressure to be sure it doesn't have any other faults before you glue it up again.