The Term Septic Spots Are Frequently Used When Describing Different

The term septic spots are frequently used when describing different skin problems. I understand it's mostly meant that they are often more spread , often pustular or oozing sores but not a sign of a generalised sepsis, (I.e red non fadeable subcutaneous skin spot in meningitis )
Is there one particular definition if septic spots or is it merely a popular term?
Med vänlig hälsning, Ina