Why do some cuts/scratches/wounds heal relatively fast, and some take a whole lot longer?

Question

I have a tiny scab on my arm that has scarred and reopened multiple times, but large surgery wounds I’ve had have healed completely in less time than I’ve had this one. Am I just stupid and missing something obvious?

EDIT: I don’t pick at scabs. I can recognise basic cause and effect.

In: 29

Answer 1

I would get it looked at. It could be a simmering bacterial infection.