If your cpo is still in the 12 month/12k mi comprehensive warranty, definitely take it in cause it will cost you nothing. If it isn't then your still covered but pay your deductible if something is wrong. Show that picture to your service writer when you take it in also.
The other month ago I noticed two quarter size spots in my garage, got under the car and saw the rear diff cover and the exhaust was wet from fluid. Found there was a TSB about the diff vent cap in cold weather. Took it to the dealer along with the TSB printout and confirmed the diff had vented...