I had an egg like that last season. It was attached to a dead egg, and once the bad egg was removed left a "window" similar to what you described. I didn't put anything on it, just left it....and actually enjoyed watching the little guy grow in his egg!

-----
Thanks,
Amy
www.myboids.4t.com
----
1.14 Normal ball pythons
1.0 Pastel ball pythons
0.0.1 Sinaloan Milk Snake
0.0.1 Plains Garter
0.1 Normal Kenyan Sand Boa
2.0 Anery Kenyan Sand Boa
1.0 Mid-Baja Rosy Boa
0.1 Leucistic Texas Rat
1.2 Dumeril's Boa
1.2 BCI
That's Just The Snakes!