There are many possible differences for what may appear to be a simple puncture...or, even a seemingly simple little scab.
Punctures on the Back and underside of the Body, Wings, Thighs, from Dog's or Cat's Eye Teeth...Breast or Keel area punctures from flying into something narrow or sharp enough to perforate...punctures anywhere from Air Rifle Pellets, Punctures from who-knows-what.
Even knowing punctures are there is often a matter of patiently, sensitively looking/feeling carefully enough.
Some infected punctures will be wet and may have distinctive odor...even if there is nothing to see in usual visual examination.
There can be serious punctures with no outer easy-to-notice of sign. Found by feeling all over the Bird's Body for any tiny bumps or damp spots...seeing then, the tiny 'bump' is a scab...or a damp spot is a rotting crater with a central hole.
Soaking the Scab in Peroxide-Water, softeneing it as best one can, removing the Scab, one may find a deep wound channel full of debris whether any notable infection is present or not.
If from an Air Rifle Pellet, the wound channel may or may not still contain the Pellet, but, it will contain feather debris the Pellet had pushed in, and, this has to be removed gently, using fine slightly blunted Tip Tweezers or fine Haemostats, in order for the wound channel to heal properly.
A puncture which has foreign debris remaining in it, can heal over eventually with no treatment, or with treatment that forgot to clean it out, with a possibility then of abcess or other liability.
Hence, it is good to carefully investigate fallen or grounded Birds ( regardless of their other or suspected issues ) for possibility of non-conspicuous puncture wounds, and, feel sensitively all over for any cues or hints of punctures.
If a hole or scab is found, see if debriding/foreign-matter-removal is called for, sluice out the wound channel if possible with mild antiseptics ( merely mix a little general Water soluable Antibiotic and Saline solution, and, use a Syringe with a few inches of soft/flexible pediatric urethral Catheter attached ) and, allow the clean wound channel or hole to heal from the inside out then, without sutures.
Shallow infected Eye Tooth or other punctures also benifit nicely from a simple debriding and sluicing out and will then clear up and heal fast.
A regimen of Oral, Systemic Antibiotics are usually good to do also, especially if Animal caused punctures, or just for prudence sake regardless of the cause or source of the wound/hole/wound channel.