The most common place for gout to manifest is in the joints of the big toe. It’s certainly not the only place it can show up, but non-joint-related gout (in my admittedly limited experience in my past life as a wound care tech) is rare. It’s also exquisitely painful, as opposed to just being sore.
First off, are you having any subjective fevers, chills, or other signs of infection?
The next thing that comes to mind is a reduction in body water or body fat making the tops of your feet more bony, allowing your footwear to a) move more freely than it once did, and b) irritate the skin more now that there’s less fat/fluid to act as a shock absorber. I’ve had a similar problem with my dress shoes, and I have to wear hiking socks under my dress socks to make the shoes fit decently.
Disclaimer: I’m not a doctor (yet) and I can’t see you or your condition, so any or all blatherings I offer should not be construed as medical advice. See your doctor if you’re concerned about any condition, if symptoms of infection develop, or if you suddenly develop the urge to salsa dance with a koala while sipping gin out of a retired architect’s tam o’shanter under the moonlight.