lump on groin

*i am aware no one on here is a doctor*

hi !! saturday morning, a lump appeared on my groin where my leg connects to my pelvis . it is painless and hard as a rock . blood cancer does run in my family so i went to the doctor yesterday . it was diagnosed as a swollen lymph node due to an infection . i was sent for a blood test and everything came back completely normal and showed there was no infection going on in my body . has anyone had or knows someone that has possibly been diagnosed with lymphoma or any type of blood cancer that can ease my mind !! i have horrible health anxiety and having a lump appear out of nowhere is scary !!!