@melissa123
It could be an inflamed lymph node. Have you been sick with a virus or bacterial infection recently?

1. https://my.clevelandclinic.org/health/body/23218-inguinal-lymph-node
2. https://www.healthline.com/health/swollen-lymph-nodes-in-groin-female
3. https://www.medicalnewstoday.com/articles/swollen-lymph-nodes-in-groin
4. https://wellwisp.com/are-there-lymph-nodes-in-your-thigh/