You must be suffering from tinea mannum
. It is a superficial fungal infection
The fungus grows in wet area. In groin area, it is due to more sweating and wetness.
Your occupation or habit needs to be changed, if you go for frequent hand wash or frequent wetting your hands.
At present you can start plain antifungal cream. Seek dermatology opinion for addition of oral antifungal
Dr. Ajit Singh Kulhari
MD - Skin & VD