My mom is a retired nurse and passed on a fair bit of first aid type knowledge to us, so I know a little about wound care.
It came in handy when the guy who lived in the apartment next to me and my husband knocked on the door and asked if I had a band aid. He'd been rollerblading with no kneepads, had fallen and really skinned his knee. It was ugly.
Fortunately, I'm not too squeamish, so I brought him inside, cleaned the knee off with a gauze pad soaked in water, got a cotton swab and dabbed plenty of antibiotic ointment on it. I bandaged it and then sent him home. He didn't even have band-aids in his house, and I had a stocked first aid kit. Bachelors.