my question is about an itch that my grandfather gets at night that is so hard and he cant sleep...

at night. He is between the age of 70-80 years old. He was diagnose with prostate growed and after getting treatment for that other issues started to come up. High blood pleasure and now this Itch that wont leave him alone. The Itch happens every day at night. It begins in the evening and it wont stop. It don't hurt him but the Itch get so intense it wont stop itching till he just falls asleep. The itch is behind the legs and he said it began around his cabs and has began to move higher in the tights and this go on for over a year. his has tried a lot of things and nothing seems to work for hi