Yesterday green lump that looked like large vein appeared on top of foot. Felt bruised. Today it's a small red bump surrounded by green bruise. Dvt?

In theory . It would not be a DVT as the D stands for deep. There is the dorsal venous arch that could get a clot but it would be superficial. Clots in the foot are usually very painful to the exact spot of the clot. If you still have something there why not go get it checked out....