A small area of numbness and pain in the groin are can be due to a hernia, pinched nerve or an infection/abscess formation. Your previous abdominal surgeries and your BMI put you at risk of getting getting a hernia. You will need a physical exam and possibly some imaging like an ultrasound or CT scan. A CT scan will rule out a new kidney stone as well. So do see your doctor regarding this.
Let me know if you have more questions or need more information. Please rate when done, so I may get credit.