I never expecting that the bumps near the scrape would progress to intense pain, waves of nausea, and blackness underneath the skin, or that those symptoms left me maybe a day to live had I not taken antibiotics supplied by a fellow traveller.
A year later, I got an infected gum/tooth situation and the dentist was closed for the weekend. Although I could have freaked out and figured out an emergency situation and a different dentist (that I may not have been covered for), I just looked up the reasonable dosage for a tooth infection and treated myself accordingly. It went away overnight, and I followed up with my dentist that week.
Note that I do not recommend self medication for anything out of the ordinary or with possible interaction effects. But for infected flesh, which is a common and dangerous medical issue, I think knowledgable self-administered use of antibiotics can be as valuable as a similar use of bandages or CPR.