Thanks for writing in.
It seems that you have suffered a trauma and the abnormal appearance of the veins could either be due to an injury
to the veins leading to a hematoma
( collection of blood) or a sprain
which can press the veins and make them look for prominent.
I suggest you apply diclofenac
gel on the local area, do some hot fomentation and apply a tight crepe bandage around the foot. You should have relief in 1-2 days. If it does not help, please see a physician who can order a Xray and rule out a fracture
Hope this helps.