What Causes Pain And Swelling Of Foot After Having A Vein Injury?

Hi my dad poked a little hole in his foot doing yard work and now he can t walk on it and turns out he poked a vein and you could see + it Swoll up and it hurts hem really bad and he can t get to a hospital at the moment do you have any idea on what happen and how we could help it until he is able to make it to the er