Weird -I also have found lumps between my legs in this sack- like bag. They seem to shrink on occasion, but then like magic , they return to normal size . I massage them vigorously, but they are still there . hmmmm ..these lumps have been there around 31 yrs for me. Do you think i should seek the advice of a medical professional ?
Do you have any oral Antibiotics ? its prolly a pocket of infection or developing scar tissue, it'll heal