Someone with diabetic issues and an untreated an infection in the foot or leg may establish gangrene. Gangrene requires tissues dying as a result of serious infection or diminished blood provide. "Periorbital edema" is a phrase for swelling across the eyes. Sometimes individuals confer with this problem as "periorbital puffiness" https://www.sgvascularctr.com/swollen-leg-why-do-i-have-it-and-what-can-i-do/