Sir I had 6.3mm kidney stone stuck in VUJ (right side) which came out in my ultrasound scan 17th april 2021 and there was no stone in right kidney at that time. After that i had ultrasound scan on 9th May 2021 and at that time also no stone was visible in right kidney. Now in my ultrasound scan on 28th May 2021, a stone of 3mm is visible in my right kidney.. my concern is that whether the stone of 3mm has been formed in 15-20 days. Is it possible that my body is making stones in short time span or is there any infection in my kidney that stones are forming.