Normal to leave everyday wounds open and untreated?
First thing I see most people do is apply some disinfectant and a plaster or bandage. I've just never done that. The wounds go away by themselves and I've never got any infections from them. The body also learns to build up stronger immunity.
Same thing with going to the doctor. People book appointments for the silliest things, like colds and flus. Drinking hot drinks and wearing warm clothes usually sort those out too.
Continually pumping antibiotics into the body decreases their effectiveness and the range that can be used in the future, when they're needed for more serious treatments.