I have a neighbor that asked me to do a dressing change for her after her spinal fusion a few years ago and honestly, it never occured to me to tell her no. But, it was just a 1 time thing.....she called and told me that her husband was out of town, she had a fever of about 102 and just generally felt like crap. I took over some gloves and 4x4's from a camping first-aid kit and removed her dressing. When I saw that there was a ton of purulent drainage from the wound, I just covered it with the dry dressing and told her son to take her to the ER. Turns out she had a staph infection and required about 3 months of IV antibiotics from a home care RN. She was so grateful, I can't even imagine telling her that wasn't in my scope of practice. Maybe I'm too naive or too trusting, but I really just saw this as doing a favor for a friend. And I would do it again.
Now when I lived in my apartment, one of my neighbors found out I was a nurse and kept knocking on my door or stopping me in the parking lot asking me questions or for medical advice.. I repeatedly told her to consult her own MD.