I developed this same problem in high school, then when I joined the Marines it got much worse. The 4 years I was
in the Marines it was diagnosed as
eczema, jock itch, dermatitis, external yeast infection, etc. Some creams would remedy it for a couple days but it would always return. I actually have a small tough scar tissue area on my scrotum and my eyelids are more wrinkled than they should be.
last year I went to see an allergist for seasonal allergies that cause me chronic sinus infections.