Most common reasons for swelling include
1) sitting/standing for extended periods through the day without sufficient movement to push the fluid out
2) hot weather (blood vessels open more in heat so fluid lingers)
3) increased or too high salt intake (typically gotten through breads and packaged foods)
4) use of aspirin, ibuprofen, or aleve type medications (NSAIDs) as well as many other pharmaceuticals
5) other triggers for increased inflammation, many of which are foods your body might be reacting to
More serious reasons for swelling include heart, liver, and kidney issues. Thus, if some of the more common issues are present and the swelling resolves with adjusting behaviors then no concern. However, if you don't have those issues then a medical eval for liver, heart or kidney issues is warranted.
Other simple measures for improving leg swelling are
1) leg elevation above the heart for 20 minutes 1-2 times per day
2) aggressive hydration to help flush excess salt out of body
3) compression stockings, especially if you're sitting all day
These are pretty much the only scenarios where antibiotics should even be considered, however, you still can resolve these issues without. Aggressive sinus rinsing (3-4 times daily) with either a Neti Pot or NeilMed squirt bottle is imperative. You can also add some antimicrobial compounds (peroxide, herbs, tea tree oil, etc.) to facilitate clearance. Hydration of 3-4 liters of water daily will help. Avoidance of gluten, dairy, and sugar for 2-3 weeks can also help. In the early days of the infection, regular zinc intake can help resolve it prior to escalation.
There are a few unique situations like imaging diagnosed sphenoid sinusitis that should always be treated, but that is rare. As a primary care physician, I've had a number upper respiratory and sinus infections over the past 20 years and never taken antibiotics once. I typically immediately start Zinc 30 mg twice daily, sinus irrigation 3-4 times daily, lots of hydration and avoidance of irritant foods, and eat lots of mushrooms (immune support), and that does the trick.
However, if you follow a normal standard American diet and lifestyle of limited movement, poor sleep, lots of sugar and refined carbohydrates, poor stress management and screen addiction, then you are almost guaranteed to get diabetes.
For Type 1 diabetes, the hereditary risk is lower, but as with all auto-immune diseases, you inherit the susceptibility and can then set yourself up to get the disease by having poor gut health (low quality diet, infections, antibiotics, NSAIDs [i.e., Aleve and Motrin], and acid blockers).