Lymph nodes are normally present in all individuals in various body parts and one of them is the location that you have described (inguinal area). There can be a number of reasons for enlargement of these nodes like infections, TB,
filariasis, trauma, cancer in the draining area. They are naturally enlarged in bare foot walkers. If you have no other symptoms (like lesions on the limb/penis/vulva/perianal area, discharge or bleeding per urethra/vagina/
rectum,
abdominal pain, etc), then the likelihood of these nodes being cancer is remote. However it is advisable for you to consult a surgeon as only after a thorough examination can a final opinion be given.