Painful itching on right foot and some swelling?

Painful itching: This constellation of symptoms could come from a spider bite or exposure to an allergen. See a podiatrist for treatment and definitive diagnosis.

Many possibilities.: Also the itching could of caused the swelling or vice a versa.....Best thing would be to see a foot doctor. You can try elevating your foot and applying an antifungal agent, but if you saw the doctor in person you wold get a definitive diagnosis.