Welcome to HealthcareMagic.
We would like more information on it to help you .When did it start ?What is the size of the swelling ?Does it change in size when you cough ? Do you have any injury
on your lower limbs ?
It could be a hernia
if it changes with cough which need a repair by general surgeon
.It could be a lymph
node swelling if you have an infection.
Please get evaluated with a General surgeon.