I know this is an old thread but I thought I'd share my recent experience.
Since I hadn't punted for a couple of weeks I hadn't shaved my balls and they were starting to itch. I ended up scratching like mad, especially during the night. Over a couple of days I also started to get itchy around the groin area and inner thighs.
First I tried E45 to try and ease the itching, but it ended up burning and making everything very red and still itchy. Moved on to Sudocrem, usually used for nappy rash. This helped a bit but by now my cock was getting itchy as hell. Decided to take a bath and put some Radox in it. Now this was my first big mistake. I am sensitive to perfumed soaps etc. I woke up in the morning and my cock was like an elephant's trunk, really swollen. After googling the subject I decided I had thrush. One natural remedy is a salt bath, so I took a couple, which eased the itching a bit. The next morning the swelling had gone down but my foreskin was a bit tight and sore, as if it had cracked a bit. Didn't look anything like the pics in Strawberry's link though
Eventually called the doctor. Spoke to the nurse and described my symptoms. She said it sounded like a fungal infection, but she didn't say thrush. She suggested a cream like Canestan would be good, but prescribed me Timodine. After only a couple of uses symptoms started to subside. All clear in a couple of days. I didn't catch it from anyone, it was just a natural reaction to all the scratching and sweatiness that followed.