What Causes Swelling In Groin?

Hi, may I answer your health queries right now ? Please type your query here... I started with swelling in right groin and mon pubus. Feels strange in that area but no actual pain now have been experiencing swelling of right leg. I have had 2 ultra sounds and a cat scan.doctors cant figure out cause. I am avery healthy 55 year femaleghat exercises regularly 5 daysa week and work full time. I feel great except this problem.