Visit dermatologist or urologist. It takes lot of time to cure this problem. So the right diagnosis and treatment is necessary. Prompt treatment is a must.
If it´s a Flaky white skin in patches or an Itchy scrotum. I am not sure but it might be a fungal infection like CANDIDA all women have it one degree or anotther. As fas as I am concerned there is no permanent solution or cure. Sorry.
Just wash up everyday with fresh purified clean soft WATER (Tap water might just be bad), add up using only 100% SeaSALT or SodiumBiCarbonate, no soaps whatsoever, then to dry up, put some drops of 100% olive OIL extra virgin gently and thoroughly massaging the affected area . Eat healthy, Do sports and Stay positively calm.
And to finish off you may try bifidubacterium found in yogurt and garlic to combat the bacteria if that´s the cause.
Wear on loose underwear so AIR circulates in-between and if necessary roll on the skin temporary to allow for skin transpiration.
Avoid cortisteroids, any medicines over the counter and any pharma drugs, they all usually make the symptoms worse and only fix it temporary at best.
Remember. Doctors are generally useless. Traditional natural remedies free of toxicity often work out better.