For the past several months, my scrotum has taken on a red hue and the skin is sweaty and colder than it should be, though the seam down the middle appears to be unaffected. It doesn't itch, but it is very sensitive now and reflects light in a way skin shouldn't. Also, the penis has gotten several shades darker. Do these symptoms sound familiar? I'd like to research this a bit more before I consult my doctor.
I am not a doctor but I have had similar symptoms; redness with the middle unaffected. Mine itched a little and burnt a little. But it sounds like a fungal infection. The sweat is probably what caused it and what makes it worse. The penis getting darker could mean that it has spread there. You should probably get it checked out sooner rather than later. I think that you can get it checked out at any doctor, dermatologist, or std testing place. I think the cream is about $35 (Nov. 2009).