good for you for noticing this. it's important for people with chronic conditions like diabetes to stay on top of any physical changes in their body. i suggest you call your primary care provider for an appointment. the kind of swelling you describe sounds like fluid retention or ' edema. ' this can be a sign of an underlying medical condition (possibly related to your diabetes or something else entirely). mild one-sided edema of the lower leg isn't necessarily cause for alarm in an otherwise healthy person. but it would be best to get it checked out. wishing you well!
suddenly my left leg is twice the size of my right leg i'm diabetic and have slept on my left side for appx 5 years