On the right leg, just slightly below the knee cap and to the left. It seems to me that there is a slight bit of swelling, but it's not very much.
No redness or bruising, no recent falls or spills. Simply came out of nowhere, and with her heart condition, I am worried about blood clots. When she is seated, putting no weight on it, it doesn't hurt as much, but it can't stand any weight at all.