Hello,
Itching in the private area and at the end of the backbone can be caused by various conditions, such as fungal infections, dermatitis, or even certain systemic conditions. Since it has been persistent for two months, it's essential to have a detailed evaluation to determine the exact cause.
Next Steps
I recommend consulting a dermatologist or a general physician for a proper diagnosis. Avoid scratching to prevent further irritation, and wear loose, breathable clothing. I am available for online consultation if needed for detailed advice.