From what you are telling, I assume that you are uncircumcised, the inner layer of the foreskin right behind the glans of the penis. If you do mean the edge of the glans, that is called corona.
I'm uncertain if you mean the inner layer of the skin just below the corona. If this is the case then there would be the possibility that you need to get used of the sensations in this area. In an uncircumcised male or in my case the inner layer of the foreskin behind the glans, looks sort of ballooned when the foreskin is retracted. This area will change if you get an erection of the penis. The corona and the skin in this area is really sensative.
If this continue to be this way, I recommand that you consult with doctor. They should be able to tell you what is normal and what is not.
God bless,
Ron
I really can't comment on your question. I'm not sure what you mean by the "neck" of your penis, and I'm not sure what the "white, spongy stuff" is to which you're referring.
At any rate, if you have a question about a medical condition affecting your penis, please post it to the urologist in the Urology Expert Forum:
www.medhelp.org/forums/show/113