If it is badly swolled, I would suggest a trip to the dr.
As for feet getting bigger, mine seem to go up and down almost daily. I wear the same boots, and essentially the same sox (same style, size, brand) every "working" day. Sometimes the boots just slide on, other days I have to force my feet into them, and loosen the laces a bit to boot (thank goodness for lace-to-toe boots)...
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OBG