My skin is very dry and itchy under scrotum sack.

Itchy scrotal skin: Itchy scrotal skin can have a number of causes, such as eczema, contact dermatitis, candida infections. Even some benign growths on scrotal skin like angiokeratomas, tiny little purple papules, can cause itching. One must be careful with using cortisone cream in this area as the skin is thin and delicate, and cortisone can cause thinning in a short period of time.