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I think you are right. I cut into quite a few little feet this year when I saw the 'scab' and a little puffing and got nothing at all out - and we did a thorough job of looking. Only time I got out a 'plug' was with a huge hard obviously infected looking foot, not just a little black scab. Mine get it because they insist on hanging out and running across my asphalt driveway /sigh. (trying to get in the garage to eat the cat's food).
Bumblefoot results from injury or abrasion which allows for the introduction of staphylococcus bacteria. Lesions can occur on toes, hocks and the pads of the feet. Staphylococcus bacteria are present wherever there are chickens. Infection occurs when a rough perch, splinter, wire floor, or a heavy birds jump from a perch more than 18 inches off the floor causes a small break in the skin, allowing bacteria to enter.
We have lots of rocks around here. I believe that is where the injuries occur here. Lots of timber and sticker bushes that can cause an injury or abrasion, too.