The glans of a chin penis isn't necessarily smooth. Please do not put any cream on the chin's penis, it will simply get ingested.
If it seems dry and doesn't want to return to it's sheath you can apply some water based lube like KY or even take a little vaseline and rub it in your fingers to get it warmed up a little and apply it.
Check very carefully for a hair ring, sometimes it can be only one hair. Since chins do not have thumbs they routinely clean the penis using their mouth, this is normal. Okay, I can not back up that it's because they don't have oppossable thumbs, but I think it's an option.
Since the weather is bad I would double check for any hair, make sure you fully extend the penis or you may miss some. It can also be possible that he had a hair ring and removed it himself. Using lubricant can help the penis slide in and out of the sheath more easily, as well as moisturize the penis if it's irritated. I would simply check it very thoroughly in good light, and leave it be for at least a day as messing with it will irritate it more. Check it again in a day or two, continue to monitor food and water intake as well as output. If the weather is as bad there as some places have gotten hit here, I personally don't feel this is important enough at this point to risk going to the vet.