Hello,
Red and itchy scrotum after sessions of swimming can be due to fungal infection. Keep the area dry, wear loose fitting clothes, and change undergarments at least twice a day. Sweat dermatitis usually responds to such treatment along with oral antihistamines (OTC ones). For fungal infection many treatment options are there like Clotrimazole 1%, Miconazole nitrate 2%, Tolnaftate 1% and Butenafine hydrochloride 1%. Many OTC products containing these salts are available, your pharmacist can help.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
I have not heard of what that is. If you don't get answers here to help you I would suggest you see your doctor.