Soft lump on top of foot?

Likely . Ganglion cyst. They are most likely attached to a tendon, soft and moveable.
Ganglion cyst. This is most likely a ganglion cyst. These are non-cancerous. They usually occur in an area where there is a lot of repeative motion. As a recommendation i would see your foot and ankle specialist. They can check it out and often they can drain the cyst or even remove it in the office with little to no pain.
Ganglion Cyst. Hello, This sounds like a Ganglion cyst. Think of it as a herniation of synovium. Its no wonder they are usually located originating from a tendon sheath or joint capsule. Always important to get lumps and bumps checked out by a specialist to rule out any other diagnosis.