My Dermatologist On August 16, 2018, Diagnosised Me With A

My Dermatologist on August 16, 2018, diagnosised me with a ganglion cyst on the top of my foot. Could this have come from the trauma of a car accident in December of 2017? I was at a bus stop & was hit hard from rear. I even had a vein rupture due to trauma, in that leg in January, 2018. I have very bad varicose vein disease, especially in that foot.
I thought this was free MD advise?