There does look to be raised scales on the foot and leg indicating scaly leg mites. The foot is pretty swollen. I think gout usually affects both feet, but that looks pretty puffy. Do you have any antibiotics, or can you see a vet? Is there anything wrong with his back toe? I would try soaking the feet in warm Epsom salts water, and see about getting some antibiotics. Others, such as Dawg53 or TwoCrows may have more advice.
For the scaly leg mites, I would gently scrub the scales to loosen them during his leg soak, and then once a week, apply a good coating of either castor oil, crisco shortening, vaseline, or vegetable oil to legs and feet, and rub into the scales.
For the scaly leg mites, I would gently scrub the scales to loosen them during his leg soak, and then once a week, apply a good coating of either castor oil, crisco shortening, vaseline, or vegetable oil to legs and feet, and rub into the scales.