I'm having pain in the top of my foot. Theres no swelling but a small lump there. Is it possible that I have a cyst or something similar?

Foot pain. You could have a cyst, called a ganglion cyst, but there are other things that could cause it too...Like arthritis, or a healed fracture, to name a few. You should have this evaluated by your physician, especially if it is getting bigger, who will be able to give you a better idea. It depends on your age, previous injury, your weight, family history, life style and many other factors.
Ganglion cyst. It is possible that is a ganglion cyst which is a benign cyst arising from a joint or tendon sheath. The cyst itself is rarely painful but it can push on a nerve an cause pain or cause irritation with shoewear.