Not a doctor. But EMT. I was working in the ER and a homeless guy comes in. Not unusual. He looked completely fine, but he's was complaining of unbearable leg pain. My job in the ER basically is to do initial assessment/vitals and to get patients settled in. So I go to check out his legs. I cut thru his pants and he's wearing knee high socks. As soon as I cut thru the elastic on the socks....maggots. Like a waterfall of them. Turns out he was wearing the same socks for 6 months and they cut into his skin. Good knees north surgeon said he could save his legs thanks to the maggots. Lesson is change your socks regularly.