Young private, Panama, got bit on my able by something and it itches like crazy, so bad that I scratched it open a bit. My boots aggravated the open wound until it had a scab, got infected and one day a friend said "dude, get in the car Lisa's taking you to the hospital. You got black veins going off of that thing."
Long story short: admission, getting the wound scrubbed with iodine and a wire brush without anaesthesia (quote from the nurse " this is gonna hurt like Hell, so just yell if you need to") and five days admission.