Thanks for posting your query.
You may have "Tinea
Cruris" a common fungal infection
You should consult with dermatologist
and take proper treatment.
Shaving of pubic hair may exacerbate your itching by putting shaving cream.
You should avoid use of soap and shampoo in pubic region.
Hot whether of Cambodia may increase your problem by precipitating sweating in pubis region.
You should use cotton undergarments for keeping pubic area dry.
Dr. Mayank Bhargava