An allergic reaction to a particular product can come on all of the sudden. You can use a product for years and simply develop an allergy to it one day. (We learned that from the allergist we had to take our son to recently). You may want to try using a different cream. I would think something unscented to see if it clears up. If you're getting zero irritation with your shaves then try not even using the Nivea for awhile. Just try to eliminate as many variables as possible, and one at a time so you'll know when you've found the cause.
Razor: Switched to the Merkur Slant full time, (I'm now an official "Slant Man")
Brush: Shavemac 177 Silvertip
[B]Best Lather setup for me:[/B]
Soap: HoneyBee Spa "Coconut" or "Lime"
Cream: Geo F Trumpers "Coconut" or "Lime"
(Soap + Cream = Super-Lather and makes me have dirty thoughts about my lather)
AS: Nivea after shave balm (most soothing on my skin I've found)
[URL="http://badgerandblade.com/vb/showthread.php?t=30710"]My little shave den[/URL]